Monodroid:找不到圖書館'com.google.android.maps'

我正在尝试构建mondroid样本 https://github.com/xamarin/monodroid-samples/tree/master/MapsAndLocationDemo。

每当我启动应用程序时，都会在输出窗口中收到以下错误：

[STDOUT] "C:'Dev'Playground'monodroid-samples'MapsAndLocationDemo'MapsAndLocationDemo.csproj" (SignAndroidPackage target) (1) ->
[STDOUT] (_GenerateJavaStubs target) -> 
[STDOUT]   C:'Program Files (x86)'MSBuild'Novell'Novell.MonoDroid.Common.targets(595,3): error MSB4018: The "GenerateJavaStubs" task failed unexpectedly. [C:'Dev'Playground'monodroid-samples'MapsAndLocationDemo'MapsAndLocationDemo.csproj]
[STDOUT] C:'Program Files (x86)'MSBuild'Novell'Novell.MonoDroid.Common.targets(595,3): error MSB4018: System.InvalidOperationException: AndroidManifest.xml : error 1: Unable to find library 'com.google.android.maps'. [C:'Dev'Playground'monodroid-samples'MapsAndLocationDemo'MapsAndLocationDemo.csproj]
[STDOUT] C:'Program Files (x86)'MSBuild'Novell'Novell.MonoDroid.Common.targets(595,3): error MSB4018:    bei Xamarin.Android.Tasks.ManifestDocument.AddAddOns(XElement app) [C:'Dev'Playground'monodroid-samples'MapsAndLocationDemo'MapsAndLocationDemo.csproj]
[STDOUT] C:'Program Files (x86)'MSBuild'Novell'Novell.MonoDroid.Common.targets(595,3): error MSB4018:    bei Xamarin.Android.Tasks.ManifestDocument.Merge(List`1 subclasses, List`1 selectedWhitelistAssemblies, Boolean embed) [C:'Dev'Playground'monodroid-samples'MapsAndLocationDemo'MapsAndLocationDemo.csproj]
[STDOUT] C:'Program Files (x86)'MSBuild'Novell'Novell.MonoDroid.Common.targets(595,3): error MSB4018:    bei Xamarin.Android.Tasks.GenerateJavaStubs.Execute() [C:'Dev'Playground'monodroid-samples'MapsAndLocationDemo'MapsAndLocationDemo.csproj]
[STDOUT] C:'Program Files (x86)'MSBuild'Novell'Novell.MonoDroid.Common.targets(595,3): error MSB4018:    bei Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() [C:'Dev'Playground'monodroid-samples'MapsAndLocationDemo'MapsAndLocationDemo.csproj]
[STDOUT] C:'Program Files (x86)'MSBuild'Novell'Novell.MonoDroid.Common.targets(595,3): error MSB4018:    bei Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask, Boolean& taskResult) [C:'Dev'Playground'monodroid-samples'MapsAndLocationDemo'MapsAndLocationDemo.csproj]

我已经检查了以下内容：

• SDK 管理器中安装的 Google API
SDK
• 平台安装在 SDK 管理器中
• 我正在使用的AVD针对GoogleAPI
• 我以管理员身份运行Visual Studio。
• 我可以成功构建一个 Hello World 示例

由于我是Mono和Android开发的新手，我确定我错过了一些明显的东西，所以请耐心等待。