"ConvertResourcesCases“任务意外失败。Xamarin Android构建

Question

当我使用Visual Studio 2017 for Mac(7.7.4 build 1)，Mono JIT编译器版本5.18.0.248 (2018-08/a4956c837e1 Fri Jan 25 16:13:12 EST 2019)构建我的Xamarin Android应用程序时，我得到以下异常：

/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: The "ConvertResourcesCases" task failed unexpectedly.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: System.IO.IOException: Could not create file "/Users/username/Companymobil/src/Company.Recipes.Droid/obj/Debug/lp/35/jl/res/values-ca/values-ca.xml" or "/var/folders/b5/821mhz8n0px17rnxglrjq5mc0000gp/T/tmp565e9644.tmp". File already exists.
/var/folders/b5/821mhz8n0px17rnxglrjq5mc0000gp/T/
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018:   at System.IO.File.Copy (System.String sourceFileName, System.String destFileName, System.Boolean overwrite) [0x00193] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-08/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.IO/File.cs:111 
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018:   at Xamarin.Android.Tasks.ConvertResourcesCases.FixupResources (Microsoft.Build.Framework.ITaskItem item, System.Collections.Generic.Dictionary`2[TKey,TValue] acwMap) [0x00204] in <78f051a6e2064f849cc3ee585300af39>:0 
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018:   at Xamarin.Android.Tasks.ConvertResourcesCases.FixupResources (System.Collections.Generic.Dictionary`2[TKey,TValue] acwMap) [0x0000f] in <78f051a6e2064f849cc3ee585300af39>:0 
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018:   at Xamarin.Android.Tasks.ConvertResourcesCases.Execute () [0x000a7] in <78f051a6e2064f849cc3ee585300af39>:0 
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018:   at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute () [0x00023] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-08/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/TaskExecutionHost/TaskExecutionHost.cs:573 
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018:   at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask (Microsoft.Build.BackEnd.ITaskExecutionHost taskExecutionHost, Microsoft.Build.BackEnd.Logging.TaskLoggingContext taskLoggingContext, Microsoft.Build.BackEnd.TaskHost taskHost, Microsoft.Build.BackEnd.ItemBucket bucket, Microsoft.Build.BackEnd.TaskExecutionMode howToExecuteTask) [0x001f6] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-08/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/Components/RequestBuilder/TaskBuilder.cs:784 
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: The "ConvertResourcesCases" task failed unexpectedly.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: System.IO.IOException: Could not create file "/Users/username/Companymobil/src/Company.ServerAnnouncement.Droid/obj/Debug/lp/15/jl/res/layout/notification_template_icon_group.xml" or "/var/folders/b5/821mhz8n0px17rnxglrjq5mc0000gp/T/tmp4d4475a7.tmp". File already exists.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018:   at System.IO.File.Copy (System.String sourceFileName, System.String destFileName, System.Boolean overwrite) [0x00193] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-08/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.IO/File.cs:111 
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018:   at Xamarin.Android.Tasks.ConvertResourcesCases.FixupResources (Microsoft.Build.Framework.ITaskItem item, System.Collections.Generic.Dictionary`2[TKey,TValue] acwMap) [0x00204] in <78f051a6e2064f849cc3ee585300af39>:0 
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018:   at Xamarin.Android.Tasks.ConvertResourcesCases.FixupResources (System.Collections.Generic.Dictionary`2[TKey,TValue] acwMap) [0x0000f] in <78f051a6e2064f849cc3ee585300af39>:0 
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018:   at Xamarin.Android.Tasks.ConvertResourcesCases.Execute () [0x000a7] in <78f051a6e2064f849cc3ee585300af39>:0 
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018:   at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute () [0x00023] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-08/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/TaskExecutionHost/TaskExecutionHost.cs:573 
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018:   at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask (Microsoft.Build.BackEnd.ITaskExecutionHost taskExecutionHost, Microsoft.Build.BackEnd.Logging.TaskLoggingContext taskLoggingContext, Microsoft.Build.BackEnd.TaskHost taskHost, Microsoft.Build.BackEnd.ItemBucket bucket, Microsoft.Build.BackEnd.TaskExecutionMode howToExecuteTask) [0x001f6] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-08/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/Components/RequestBuilder/TaskBuilder.cs:784 

如果我单击Build (而不是Rebuild)，那么每次构建时这些异常都会减少，直到最终构建成功。

如果我使用jetbrains Rider，每次构建都能正常工作。

我为异常中提到的目录中的每个人授予了完全权限(r/w)，但仍然收到错误。我使用APFS，不区分大小写。

我将非常感谢任何指针来解决这个问题。

Answer 1

非常感谢来自微软的Leon Lu为我指明了正确的方向。该错误源于并行构建xamarin android时的一个条件。当禁用并行构建时，每次的结果都是相同的。并行构建可以在Visual Studio 2017 for Mac的首选项中禁用(见附图)。

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这个问题似乎已经解决了(参见Leon Lu评论中的GitHub链接)，并将在未来的更新中推出。