Example messages (メッセージの例)
Your project references 'Foo.dll' which uses the `_Microsoft.Android.Resource.Designer` assembly, but you do not have this feature enabled. Please set the `AndroidUseDesignerAssembly` MSBuild property to `true` in your project file.
解決策
Edit your csproj directly and change the 'AndroidUseDesignerAssembly' to True.