c# - エラー MSB4018: "ResolveSdks" monodevelop

Question

monodevelopで次のエラーが発生しました：

C:\Program Files (x86)\MSBuild\Novell\Novell.MonoDroid.Common.targets(2,2): Error MSB4018: The "ResolveSdks" task failed unexpectedly.
System.ArgumentNullException: Value cannot be null.
Parameter name: path1
   at System.IO.Path.Combine(String path1, String path2, String path3)
   at Novell.MonoDroid.Build.Tasks.ResolveSdks.Execute()
   at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask, Boolean& taskResult) (MSB4018) (test)

どうすれば修正できますか？バージョンを変更しても機能しません