Flutter 缓存的网络映像在Flatter中使用非nullable后抛出错误

当前使用非Nullable for Flatter，除了缓存的\u网络\u图像之外，所有依赖项都可以正常工作

我的pubspec.yaml：

environment:
  sdk: ">=2.10.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  cached_network_image: ^2.3.3

我还添加了analysis_options.yaml：

analyzer:
  enable-experiment:
    - non-nullable

我得到的错误是：

../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/compat.dart:1:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/compat.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:5:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/compat.dart' show SqfliteOptions;
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/constant.dart:1:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/constant.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/utils.dart:1:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/utils.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/utils/utils.dart:1:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/utils/utils.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqlite_api.dart:1:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/sqlite_api.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:18:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/factory_mixin.dart'
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:8:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/database.dart' // ignore: implementation_imports
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:12:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/database_mixin.dart' // ignore: implementation_imports
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:16:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/exception.dart'
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:20:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/factory.dart' show SqfliteDatabaseFactory;
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:21:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/mixin/constant.dart'
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:32:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/mixin/factory.dart'
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sql_builder.dart:1:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/sql_builder.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:13:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite/src/compat.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:16:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'sqlite_api.dart';

../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sql.dart:5:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite/src/sql_builder.dart'
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:12:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite/sql.dart' show ConflictAlgorithm;
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:70:17: Error: Optional parameter 'duration' should have a default value because its type 'Duration' doesn't allow null.
 - 'Duration' is from 'dart:core'.
      {Duration duration, void Function() callback}) {
                ^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:70:43: Error: Optional parameter 'callback' should have a default value because its type 'void Function()' doesn't allow null.
      {Duration duration, void Function() callback}) {
                                          ^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:128:10: Error: Optional parameter 'version' should have a default value because its type 'int' doesn't allow null.
    {int version,
         ^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:129:27: Error: Optional parameter 'onConfigure' should have a default value because its type 'FutureOr<void> Function(Database)' doesn't allow null.
 - 'Database' is from 'package:sqflite_common/sqlite_api.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/sqlite_api.dart').
    OnDatabaseConfigureFn onConfigure,
                          ^^^^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:130:24: Error: Optional parameter 'onCreate' should have a default value because its type 'FutureOr<void> Function(Database, int)' doesn't allow null.
 - 'Database' is from 'package:sqflite_common/sqlite_api.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/sqlite_api.dart').
    OnDatabaseCreateFn onCreate,
                       ^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:131:31: Error: Optional parameter 'onUpgrade' should have a default value because its type 'FutureOr<void> Function(Database, int, int)' doesn't allow null.
 - 'Database' is from 'package:sqflite_common/sqlite_api.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/sqlite_api.dart').
    OnDatabaseVersionChangeFn onUpgrade,
                              ^^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:132:31: Error: Optional parameter 'onDowngrade' should have a default value because its type 'FutureOr<void> Function(Database, int, int)' doesn't allow null.
 - 'Database' is from 'package:sqflite_common/sqlite_api.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/sqlite_api.dart').
    OnDatabaseVersionChangeFn onDowngrade,
                              ^^^^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:133:22: Error: Optional parameter 'onOpen' should have a default value because its type 'FutureOr<void> Function(Database)' doesn't allow null.
 - 'Database' is from 'package:sqflite_common/sqlite_api.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/sqlite_api.dart').
    OnDatabaseOpenFn onOpen,
                     ^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/factory_impl.dart:10:24: Error: Field '_databaseFactory' should be initialized because its type 'SqfliteDatabaseFactory' doesn't allow null.
 - 'SqfliteDatabaseFactory' is from 'package:sqflite_common/src/factory.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/src/factory.dart').
SqfliteDatabaseFactory _databaseFactory;
                       ^^^^^^^^^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/factory_impl.dart:42:30: Error: The value 'null' can't be assigned to a variable of type 'SqfliteDatabaseFactory' because 'SqfliteDatabaseFactory' is not nullable.
 - 'SqfliteDatabaseFactory' is from 'package:sqflite_common/src/factory.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/src/factory.dart').
    sqfliteDatabaseFactory = null;

../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/factory_impl.dart:53:5: Warning: Operand of null-aware operation '??=' has type 'SqfliteDatabaseFactory' which excludes null.
 - 'SqfliteDatabaseFactory' is from 'package:sqflite_common/src/factory.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/src/factory.dart').
    _databaseFactory ??= SqfliteDatabaseFactoryImpl();
    ^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/factory_impl.dart:67:5: Warning: Operand of null-aware operation '??=' has type 'SqfliteDatabaseFactory' which excludes null.
 - 'SqfliteDatabaseFactory' is from 'package:sqflite_common/src/factory.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/src/factory.dart').
    _databaseFactory ??= SqfliteDatabaseFactoryImpl();
    ^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_impl.dart:17:13: Error: A value of type 'Future<T?>' can't be returned from a function with return type 'Future<T>' because 'T?' is nullable and 'T' isn't.
 - 'Future' is from 'dart:async'.
    channel.invokeMethod<T>(method, arguments);



FAILURE: Build failed with an exception.

* Where:
Script '/../flutter_tools/gradle/flutter.gradle' line: 900

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDevDebug'.
> Process 'command '/../flutter/bin/flutter'' finished with non-zero exit value 1

。/../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/compat.dart:1:1:错误：不允许空安全库从选择退出库导出声明。
导出“包：sqflite_common/src/compat.dart”；
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:5:1:错误：不允许空安全库从一个或多个选择退出库导出声明。
export“package:sqflite_common/src/compat.dart”显示sqflite选项；
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/constant.dart:1:1:错误：不允许空安全库从一个或多个选择退出库导出声明。
导出“包：sqflite_common/src/constant.dart”；
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/utils.dart:1:1:错误：不允许空安全库从一个或多个选择退出库导出声明。
导出“包：sqflite_common/src/utils.dart”；
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/utils/utils.dart:1:1:错误：不允许空安全库从一个或多个选择退出库导出声明。
导出“包：sqflite_common/utils/utils.dart”；
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqlite_api.dart:1:1:错误：不允许空安全库从选择退出库导出声明。
导出“包：sqflite_common/sqlite_api.dart”；
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:18:1:错误：不允许空安全库从一个或多个选择退出库导出声明。
导出“包：sqflite_common/src/factory_mixin.dart”
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:8:1:错误：不允许空安全库从选择退出库导出声明。
export'package:sqflite\u common/src/database.dart'//忽略：实现\u导入
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:12:1:错误：不允许空安全库从选择退出库导出声明。
export'package:sqflite\u common/src/database\u mixin.dart'//忽略：实现\u导入
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:16:1:错误：不允许空安全库从一个或多个选择退出库导出声明。
导出“包：sqflite_common/src/exception.dart”
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:20:1:错误：不允许空安全库从选择退出库导出声明。
导出“包：sqflite_common/src/factory.dart”显示SqfliteDatabaseFactory；
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:21:1:错误：不允许空安全库从选择退出库导出声明。
导出“包：sqflite_common/src/mixin/constant.dart”
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:32:1:错误：不允许空安全库从一个或多个选择退出库导出声明。
导出“包：sqflite_common/src/mixin/factory.dart”
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sql_builder.dart:1:1:错误：不允许空安全库从一个或多个选择退出库导出声明。
导出“包：sqflite_common/src/sql_builder.dart”；
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:13:1:错误：不允许空安全库从一个或多个选择退出库导出声明。
出口“包装：sqflite/src/compat.dart”；
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:16:1:错误：不允许空安全库从选择退出库导出声明。
导出“sqlite_api.dart”；
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sql.dart:5:1:错误：不允许空安全库从选择退出库导出声明。
导出“包：sqflite/src/sql\u builder.dart”
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:12:1:错误：不允许空安全库从一个或多个选择退出库导出声明。
export'包：sqflite/sql.dart'显示冲突算法；
^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:70:17:错误：可选参数“duration”应具有默认值，因为其类型“duration”不允许为null。
-“持续时间”来自“飞镖：核心”。
{持续时间，void函数（）回调}）{
^^^^^^^^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:70:43:错误：可选参数“callback”应具有默认值，因为其类型“void Function（）”不允许为null。
{持续时间，void函数（）回调}）{
^^^^^^^^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:128:10:错误：可选参数“version”应具有默认值，因为其类型“int”不允许为null。
{int版本，
^^^^^^^
../../Development/flatter/.pub cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:129:27:错误：可选p
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/compat.dart:1:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/compat.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:5:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/compat.dart' show SqfliteOptions;
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/constant.dart:1:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/constant.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/utils.dart:1:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/utils.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/utils/utils.dart:1:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/utils/utils.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqlite_api.dart:1:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/sqlite_api.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:18:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/factory_mixin.dart'
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:8:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/database.dart' // ignore: implementation_imports
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:12:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/database_mixin.dart' // ignore: implementation_imports
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:16:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/exception.dart'
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:20:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/factory.dart' show SqfliteDatabaseFactory;
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:21:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/mixin/constant.dart'
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_import.dart:32:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/mixin/factory.dart'
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sql_builder.dart:1:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite_common/src/sql_builder.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:13:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite/src/compat.dart';
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:16:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'sqlite_api.dart';

../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sql.dart:5:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite/src/sql_builder.dart'
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:12:1: Error: Null safe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:sqflite/sql.dart' show ConflictAlgorithm;
^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:70:17: Error: Optional parameter 'duration' should have a default value because its type 'Duration' doesn't allow null.
 - 'Duration' is from 'dart:core'.
      {Duration duration, void Function() callback}) {
                ^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:70:43: Error: Optional parameter 'callback' should have a default value because its type 'void Function()' doesn't allow null.
      {Duration duration, void Function() callback}) {
                                          ^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:128:10: Error: Optional parameter 'version' should have a default value because its type 'int' doesn't allow null.
    {int version,
         ^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:129:27: Error: Optional parameter 'onConfigure' should have a default value because its type 'FutureOr<void> Function(Database)' doesn't allow null.
 - 'Database' is from 'package:sqflite_common/sqlite_api.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/sqlite_api.dart').
    OnDatabaseConfigureFn onConfigure,
                          ^^^^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:130:24: Error: Optional parameter 'onCreate' should have a default value because its type 'FutureOr<void> Function(Database, int)' doesn't allow null.
 - 'Database' is from 'package:sqflite_common/sqlite_api.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/sqlite_api.dart').
    OnDatabaseCreateFn onCreate,
                       ^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:131:31: Error: Optional parameter 'onUpgrade' should have a default value because its type 'FutureOr<void> Function(Database, int, int)' doesn't allow null.
 - 'Database' is from 'package:sqflite_common/sqlite_api.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/sqlite_api.dart').
    OnDatabaseVersionChangeFn onUpgrade,
                              ^^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:132:31: Error: Optional parameter 'onDowngrade' should have a default value because its type 'FutureOr<void> Function(Database, int, int)' doesn't allow null.
 - 'Database' is from 'package:sqflite_common/sqlite_api.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/sqlite_api.dart').
    OnDatabaseVersionChangeFn onDowngrade,
                              ^^^^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/sqflite.dart:133:22: Error: Optional parameter 'onOpen' should have a default value because its type 'FutureOr<void> Function(Database)' doesn't allow null.
 - 'Database' is from 'package:sqflite_common/sqlite_api.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/sqlite_api.dart').
    OnDatabaseOpenFn onOpen,
                     ^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/factory_impl.dart:10:24: Error: Field '_databaseFactory' should be initialized because its type 'SqfliteDatabaseFactory' doesn't allow null.
 - 'SqfliteDatabaseFactory' is from 'package:sqflite_common/src/factory.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/src/factory.dart').
SqfliteDatabaseFactory _databaseFactory;
                       ^^^^^^^^^^^^^^^^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/factory_impl.dart:42:30: Error: The value 'null' can't be assigned to a variable of type 'SqfliteDatabaseFactory' because 'SqfliteDatabaseFactory' is not nullable.
 - 'SqfliteDatabaseFactory' is from 'package:sqflite_common/src/factory.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/src/factory.dart').
    sqfliteDatabaseFactory = null;

../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/factory_impl.dart:53:5: Warning: Operand of null-aware operation '??=' has type 'SqfliteDatabaseFactory' which excludes null.
 - 'SqfliteDatabaseFactory' is from 'package:sqflite_common/src/factory.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/src/factory.dart').
    _databaseFactory ??= SqfliteDatabaseFactoryImpl();
    ^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/factory_impl.dart:67:5: Warning: Operand of null-aware operation '??=' has type 'SqfliteDatabaseFactory' which excludes null.
 - 'SqfliteDatabaseFactory' is from 'package:sqflite_common/src/factory.dart' ('../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite_common-1.0.2+1/lib/src/factory.dart').
    _databaseFactory ??= SqfliteDatabaseFactoryImpl();
    ^
../../../Development/flutter/.pub-cache/hosted/pub.dartlang.org/sqflite-1.3.2+1/lib/src/sqflite_impl.dart:17:13: Error: A value of type 'Future<T?>' can't be returned from a function with return type 'Future<T>' because 'T?' is nullable and 'T' isn't.
 - 'Future' is from 'dart:async'.
    channel.invokeMethod<T>(method, arguments);



FAILURE: Build failed with an exception.

* Where:
Script '/../flutter_tools/gradle/flutter.gradle' line: 900

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDevDebug'.
> Process 'command '/../flutter/bin/flutter'' finished with non-zero exit value 1


 "args": [
            "--enable-experiment=non-nullable",
            "--no-sound-null-safety",
        ]