учил следующую ошибку при сборке apk файла из unity на mac osx sierra. это также хорошо работает до перезагрузки моего MacBook, но не сейчас.

Я добавил подробности ошибки ниже:

Примечание: я использую Facebook SDK.

Error: Error while saving blame file, build will continue
Error: The prefix "tools" for attribute "tools:overrideLibrary" ,associated with an element type "uses-sdk" is not bound.

UnityEditor.HostView:OnGUI()

а также:

AndroidSDKToolsException: Unable to merge android manifests. See the Console for more details. 
UnityEditor.Android.AndroidSDKTools.DetectErrorsAndWarnings (System.String logMessages, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.RunCommandInternal (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.RunCommandSafe (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.RunCommand (System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.RunCommand (System.String[] sdkToolCommand, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.RunCommand (System.String[] sdkToolCommand, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.MergeManifests (System.String target, System.String mainManifest, System.String[] libraryManifests, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit)
UnityEditor.Android.PostProcessor.Tasks.GenerateManifest.MergeManifests (UnityEditor.Android.PostProcessor.PostProcessorContext context, System.String targetManifest, System.String mainManifest)
UnityEditor.Android.PostProcessor.Tasks.GenerateManifest.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.HostView:OnGUI()

прошлой

UnityEditor.BuildPlayerWindow+BuildMethodException: Build failed with errors.
  at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x001b9] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindowBuildMethods.cs:162 
  at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x00050] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindowBuildMethods.cs:83 
UnityEditor.HostView:OnGUI()