Php 如何解决我的问题？请帮帮我。我想将我的laravel项目5.2升级到7。但作曲家返回了这个问题

无论出于何种原因，您的异常处理程序似乎丢失了。它应该位于

app/Exceptions/Handler.php

中。如果它在那里，你可能有自动加载的问题

如果不是，则看起来是您无意中删除了它。您可以在此处找到源文件（7.x版）：

---

将该文件插入代码。

从5.2升级到7是一个巨大的飞跃。变化很大。查看每个次要和主要versjon的升级指南，尤其是两者之间的升级指南，并以增量方式进行升级。此外，一篇只有大量错误的帖子对我们帮助不大。我建议逐个升级每个主要版本，但在升级之前先升级到5的最高版本。每个主要版本的升级指南都将能够检查每个主要版本中的任何突破性更改。这需要一段时间，但总比一次完成要好得多。尽管如此，评论员所说的绝对正确。查看Laravel升级指南并逐步增加版本号。自5.2以来发生了很多变化

PHP Fatal error:  Uncaught ReflectionException: Class App\Exceptions\Handler does not exist in G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Container\Container.php:809
Stack trace:
#0 G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Container\Container.php(809): ReflectionClass->__construct('App\\Exceptions\\...')
#1 G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Container\Container.php(691): Illuminate\Container\Container->build('App\\Exceptions\\...')
#2 G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Foundation\Application.php(796): Illuminate\Container\Container->resolve('App\\Exceptions\\...', Array, false)
#3 G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Container\Container.php(269): Illuminate\Foundation\Application->resolve('App\\Exceptions\\...', Array, false)
#4 G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Container\Container.php(805): Illuminate\Con in G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Container\Container.php on line 811
PHP Fatal error:  Uncaught ReflectionException: Class App\Exceptions\Handler does not exist in G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Container\Container.php:809
Stack trace:
#0 G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Container\Container.php(809): ReflectionClass->__construct('App\\Exceptions\\...')
#1 G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Container\Container.php(691): Illuminate\Container\Container->build('App\\Exceptions\\...')
#2 G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Foundation\Application.php(796): Illuminate\Container\Container->resolve('App\\Exceptions\\...', Array, false)
#3 G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Container\Container.php(269): Illuminate\Foundation\Application->resolve('App\\Exceptions\\...', Array, false)
#4 G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Container\Container.php(805): Illuminate\Con in G:\xampp\htdocs\shomoynews_dynamic\vendor\laravel\framework\src\Illuminate\Container\Container.php on line 811