我遇到了这个问题，我的应用程序无法编译。我尝试在我的应用程序中使用Play服务，但它给我报错"资源未找到"，我感到非常沮丧，于是移除了所有的Xamarin文件并重新安装了一切。那个问题消失了，但现在又出现了这个错误。任何帮助将不胜感激。顺便说一下，我是一个Android开发的初学者。以下是部分错误信息：
2>C:\Program Files\Java\jdk1.8.0_91\\bin\keytool.exe -list -alias androiddebugkey -storepass android -keypass android -keystore "C:\Users\xxxx\AppData\Local\Xamarin\Mono for Android\debug.keystore"
2>C:\Program Files\Java\jdk1.8.0_91\\bin\jarsigner.exe -keystore "C:\Users\xxxx\AppData\Local\Xamarin\Mono for Android\debug.keystore" -storepass android -keypass android -digestalg SHA1 -sigalg md5withRSA -signedjar bin\Debug\\Messenger.Messenger-Signed-Unaligned.apk C:\Users\xxxx\Desktop\projects\test\Messenger\Messenger\obj\Debug\android\bin\Messenger.Messenger.apk androiddebugkey
2>No -tsa or -tsacert is provided and this jar is not timestamped. Without a timestamp, users may not be able to validate this jar after the signer certificate's expiration date (2046-08-06) or after any future revocation date.
2>C:\Users\xxxx\AppData\Local\Android\android-sdk\build-tools\24.0.1\zipalign.exe 4 "C:\Users\xxxx\Desktop\projects\test\Messenger\Messenger\bin\Debug\Messenger.Messenger-Signed-Unaligned.apk" "bin\Debug\\Messenger.Messenger-Signed.apk"
2>:Deployment failed
2>Mono.AndroidTools.InstallFailedException: Failure [INSTALL_FAILED_UPDATE_INCOMPATIBLE]
2> at Mono.AndroidTools.Internal.AdbOutputParsing.Che`enter code here`ckInstallSuccess(String output, String packageName)
2> at Mono.AndroidTools.AndroidDevice.<InstallPackage>c__AnonStoreyE.<>m__0(Task`1 t)
2> at System.Threading.Tasks.ContinuationTaskFromResultTask`1.InnerInvoke()
2> at System.Threading.Tasks.Task.Execute()
2>The "InstallPackageAssemblies" task failed unexpectedly.
2>System.AggregateException: One or more errors occurred. ---> Xamarin.AndroidTools.AndroidDeploymentException: InternalError ---> Mono.AndroidTools.InstallFailedException: Failure [INSTALL_FAILED_UPDATE_INCOMPATIBLE]
2> at Mono.AndroidTools.Internal.AdbOutputParsing.CheckInstallSuccess(String output, String packageName)
2> at Mono.AndroidTools.AndroidDevice.<InstallPackage>c__AnonStoreyE.<>m__0(Task`1 t)
2> at System.Threading.Tasks.ContinuationTaskFromResultTask`1.InnerInvoke()
2> at System.Threading.Tasks.Task.Execute()
2> --- End of inner exception stack trace ---
2> at Xamarin.AndroidTools.AndroidDeploySession.<RunLoggedAsync>c__async1.MoveNext()
2>--- End of stack trace from previous location where exception was thrown ---
2> at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
2> at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
2> at Xamarin.AndroidTools.AndroidDeploySession.<StartAsync>c__async0.MoveNext()
2> --- End of inner exception stack trace ---
2> at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
2> at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
2> at System.Threading.Tasks.Task.Wait()
2> at Xamarin.Android.Tasks.InstallPackageAssemblies.Execute()
2> at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
2> at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()
2>---> (Inner Exception #0) Xamarin.AndroidTools.AndroidDeploymentException: InternalError ---> Mono.AndroidTools.InstallFailedException: Failure [INSTALL_FAILED_UPDATE_INCOMPATIBLE]
2> at Mono.AndroidTools.Internal.AdbOutputParsing.CheckInstallSuccess(String output, String packageName)
2> at Mono.AndroidTools.AndroidDevice.<InstallPackage>c__AnonStoreyE.<>m__0(Task`1 t)
2> at System.Threading.Tasks.ContinuationTaskFromResultTask`1.InnerInvoke()
2> at System.Threading.Tasks.Task.Execute()
2> --- End of inner exception stack trace ---
2> at Xamarin.AndroidTools.AndroidDeploySession.<RunLoggedAsync>c__async1.MoveNext()
2>--- End of stack trace from previous location where exception was thrown ---
2> at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
2> at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
2> at Xamarin.AndroidTools.AndroidDeploySession.<StartAsync>c__async0.MoveNext()<---
2>
2>Build FAILED.
2>