每次我尝试构建或清理我的项目时，我都会收到“Execution failed for task 'app：mergeDebugResource'”错误。我已经多次重新安装Gradle、Java、Android Studio和所有SDK，所以不是这样的。StackOverflow上的答案似乎都没有帮助。我正在尝试学习Android开发，但由于此错误而无法学习。请帮助我！
以下是Gradle构建--堆栈跟踪的结果：

Dhruvs-MacBook-Pro:app dhruv$ gradle build --stacktrace
:app:preBuild UP-TO-DATE                                                       
:app:preDebugBuild UP-TO-DATE     
:app:compileDebugNdk UP-TO-DATE     
:app:checkDebugManifest                
:app:preReleaseBuild UP-TO-DATE     
:app:prepareComAndroidSupportAppcompatV72103Library                
:app:prepareComAndroidSupportSupportV42103Library                
:app:prepareDebugDependencies                 
:app:compileDebugAidl                 
:app:compileDebugRenderscript                 
:app:generateDebugBuildConfig                 
:app:generateDebugAssets UP-TO-DATE      
:app:mergeDebugAssets                 
:app:generateDebugResValues UP-TO-DATE      
:app:generateDebugResources                 
:app:mergeDebugResources          
    /Users/dhruv/AndroidStudioProjects/MyApplication4/app/build/intermediates/exploded-aar/com.android.support/appcompat-v7/21.0.3/res/values/values.xml: Error: org.apache.xerces.dom.DocumentImpl cannot be cast to org.apache.xerces.dom.DeferredDocumentImpl
 :app:mergeDebugResources FAILED          

 FAILURE: Build failed with an exception.

 * What went wrong:
 Execution failed for task ':app:mergeDebugResources'.
 >  /Users/dhruv/AndroidStudioProjects/MyApplication4/app/build/intermediates/exploded-aar/com.android.support/appcompat-v7/21.0.3/res/values/values.xml: Error: org.apache.xerces.dom.DocumentImpl cannot be cast to org.apache.xerces.dom.DeferredDocumentImpl

 * Try:        
 Run with --info or --debug option to get more log output.

 * Exception is:
 org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:mergeDebugResources'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
    at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
    at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:64)
    at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
    at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:42)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
    at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
    at org.gradle.api.internal.AbstractTask.executeWithoutThrowingTaskFailure(AbstractTask.java:305)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.executeTask(AbstractTaskPlanExecutor.java:79)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:63)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:51)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:23)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:88)
    at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:29)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
    at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
    at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:68)
    at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:55)
    at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:149)
    at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:106)
    at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:86)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:80)
    at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:33)
    at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:24)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:36)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:26)
    at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:51)
    at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:171)
    at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:237)
    at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:210)
    at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:35)
    at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24)
    at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:206)
    at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:169)
    at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
    at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
    at org.gradle.launcher.Main.doAction(Main.java:33)
    at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
    at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:54)
    at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:35)
    at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
    Caused by: com.android.build.gradle.tasks.ResourceException: /Users/dhru/AndroidStudioProjects/MyApplication4/app/build/intermediates/exploded-aar/com.android.support/appcompat-v7/21.0.3/res/values/values.xml: Error: org.apache.xerces.dom.DocumentImpl cannot be cast to org.apache.xerces.dom.DeferredDocumentImpl
            at com.android.build.gradle.tasks.MergeResources.doFullTaskAction(MergeResources.groovy:119)
        at com.android.build.gradle.internal.tasks.IncrementalTask.taskAction(IncrementalTask.groovy:70)
        at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:63)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$IncrementalTaskAction.doExecute(AnnotationProcessingTaskFactory.java:235)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:211)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$IncrementalTaskAction.execute(AnnotationProcessingTaskFactory.java:222)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:200)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)
        ... 44 more
Caused by: /Users/dhruv/AndroidStudioProjects/MyApplication4/app/build/intermediates/exploded-aar/com.android.support/appcompat-v7/21.0.3/res/values/values.xml: Error: org.apache.xerces.dom.DocumentImpl cannot be cast to org.apache.xerces.dom.DeferredDocumentImpl
    at com.android.ide.common.res2.MergedResourceWriter.postWriteAction(MergedResourceWriter.java:333)
     at com.android.ide.common.res2.MergeWriter.end(MergeWriter.java:48)
     at com.android.ide.common.res2.MergedResourceWriter.end(MergedResourceWriter.java:125)
    at com.android.ide.common.res2.DataMerger.mergeData(DataMerger.java:291)
    at com.android.ide.common.res2.ResourceMerger.mergeData(ResourceMerger.java:48)
    at com.android.build.gradle.tasks.MergeResources.doFullTaskAction(MergeResources.groovy:112)
    ... 52 more
Caused by: java.lang.ClassCastException: org.apache.xerces.dom.DocumentImpl cannot be cast to org.apache.xerces.dom.DeferredDocumentImpl
/Users/dhruv/AndroidStudioProjects/MyApplication4/app/build/intermediates/exploded-aar/com.android.support/appcompat-v7/21.0.3/res/drawable-xhdpi/abc_ab_share_pack_holo_light.9.png: libpng warning: iCCP: Not recognizing known sRGB profile that has been edited

at org.apache.xerces.dom.DeferredAttrNSImpl.synchronizeChildren(Unknown Source)
at org.apache.xerces.dom.AttrImpl.setOwnerDocument(Unknown Source)
at org.apache.xerces.dom.NamedNodeMapImpl.setOwnerDocument(Unknown Source)
at org.apache.xerces.dom.ElementImpl.setOwnerDocument(Unknown Source)
at org.apache.xerces.dom.CoreDocumentImpl.adoptNode(Unknown Source)
at com.android.ide.common.res2.NodeUtils.adoptNode(NodeUtils.java:49)
at com.android.ide.common.res2.MergedResourceWriter.postWriteAction(MergedResourceWriter.java:320)
    ... 57 more

BUILD FAILED  

Total time: 14.776 secs

谢谢你！