Android 生成签名Apk时上载crashlytics映射文件时出错

建造时，与proguard签署了apk，用于Crashlytics

我正在犯错误

* What went wrong:
Execution failed for task ':app:uploadCrashlyticsMappingFileProProdRelease'.
> Expected file collection to contain exactly one file, however, it contains no files.

项目级梯度

dependencies {
    classpath 'com.android.tools.build:gradle:3.6.3'
    classpath 'com.google.gms:google-services:4.3.3'
    classpath 'com.google.firebase:firebase-crashlytics-gradle:2.2.0'
}

apply plugin: 'com.google.firebase.crashlytics'

dependencies {
    implementation 'com.google.firebase:firebase-crashlytics:17.1.0'
}

应用程序级渐变

dependencies {
    classpath 'com.android.tools.build:gradle:3.6.3'
    classpath 'com.google.gms:google-services:4.3.3'
    classpath 'com.google.firebase:firebase-crashlytics-gradle:2.2.0'
}

apply plugin: 'com.google.firebase.crashlytics'

dependencies {
    implementation 'com.google.firebase:firebase-crashlytics:17.1.0'
}

Android Studio版本4.0.1

同一数据的完整堆栈跟踪

异常为：org.gradle.api.tasks.TaskExecutionException:任务的执行失败：app:uploadCrashlyticsMappingFileProProdRelease'。在org.gradle.api.internal.tasks.execution.ExecutionStaskExecuter$3.accept（ExecuteActionsTaskExecuter.java:166）在org.gradle.api.internal.tasks.execution.ExecutionStaskExecuter$3.accept（ExecuteActionsTaskExecuter.java:163）在org.gradle.internal.Try$Failure.ifSuccessfulOrElse（Try.java:191）在org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute（ExecuteActionsTaskExecuter.java:156）在org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute（ValidatingTaskExecuter.java:62）在org.gradle.api.internal.tasks.tasks.execute.skipptySourceFileStaskeXecuter.executer.executer.execute（skipptysourcetouter.java:在org.gradle.api.internal.tasks.execution.ResolveBeforeExecutionOutputsTaskExecuter.execute（ResolveBeforeExecutionOutputsTaskExecuter.java:67）在org.gradle.api.internal.tasks.execution.ResolveAfterPreviousExecutionStateTaskExecuter.execute（ResolveAfterPreviousExecutionStateTaskExecuter.java:46）在org.gradle.api.internal.tasks.execution.cleanupstaleoutputsecuter.execute（cleanupstaleoutpsecuter.java:94）在org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute（FinalizePropertiesTaskExecuter.java:46）在org.gradle.api.internal.tasks.execute.ResolveTaskExecuter（ResolveTaskExecutionModeExecuter.java:95）在org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute（SkipTaskWithNoActionsExecuter.java:57）在org.gradle.api.internal.tasks.execute.SkipOnlyIfTaskExecuter.execute（SkipOnlyIfTaskExecuter.java:56）在org.gradle.api.internal.tasks.execute.execute（CatchExceptionTaskExecuter.java:36）org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask（EventFiringTaskExecuter.java:77）org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call（EventFiringTaskExecuter.java:55）org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call（EventFiringTaskExecuter.java:52）位于org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationExecutor.execute（DefaultBuildOperationExecutor.java:416）位于org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationExecutor.execute（DefaultBuildOperationExecutor.java:406）位于org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute（DefaultBuildOperationExecutor.java:165）位于org.gradle.internal.operations.DefaultBuildOperationExecutor.execute（DefaultBuildOperationExecutor.java:250）位于org.gradle.internal.operations.DefaultBuildOperationExecutor.java:158在org.gradle.internal.operations.DefaultBuildOperationExecutor.call（DefaultBuildOperationExecutor.java:102）在org.gradle.internal.operations.DelegatingBuildOperationExecutor.call（DelegatingBuildOperationExecutor.java:36）在org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.Executer（EventFiringTaskExecuter.java:52）上在org.gradle.execution.plan.LocalTaskNodeExecutor.execute（LocalTaskNodeExecutor.java:43）在org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorAction.execute（DefaultTaskExecutionGraph.java:355）在org.gradle.execution.taskgraph.DefaultTaskGraph.DefaultTaskExecutionGraph$InvokeExecutorAction.java:343）在org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$buildOperationaWareeExecutionAction.execute（DefaultTaskExecutionGraph.java:336）在org.gradle.executionGraph.DefaultTaskExecutionGraph$buildOperationaWareeExecutionAction.execute（DefaultTaskExecutionGraph.java:322）在org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute（DefaultPlanExecutor.java:134）在org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute（DefaultPlanExecutor.java:129）在org.gradle.execution.plan.plan.DefaultPlanExecutor$executor.java:202）在org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNext节点（DefaultPlanExecutor.java:193）在org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run（DefaultPlanExecutor.java:129）在org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute（executpolicy.java:64在org.gradle.internal.concurrent.ManagedExecutorImpl$1.run（ManagedExecutorImpl.java:48）在org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run（ThreadFactoryImpl.java:56）导致：java.lang.IllegalStateException:预期文件集合只包含一个文件，但它不包含任何文件。org.gradle.api.internal.file.AbstractFileCollection.getSingleFile（AbstractFileCollection.java:64）org.gradle.api.file.FileCollection$getSingleFile.call（未知源）com.google.firebase.crashlytics.buildtools.gradle.tasks.UploadMappingFileTask.uploadMappingFile（UploadMappingFileTask.groovy:60）org.gradle.internal.reflect.JavaMethod.invoke（JavaMethod.java:103）org.gradle.api.internal.project.taskfactory.StandardTaskAction.doExecute（StandardTaskAction.java:49）org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute（StandardTaskAction.java:42）org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute（StandardTaskAction.java:28）org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute（AbstractTaskTask.java:717）在org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute（AbstractTask.java:684）在org.gradle.api.internal.tasks.executeActionStataskeExecuter$5.run（ExecuteActionStataskeExecuter.java:476）在org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationW