Error MSB4018: The "ResolveSdks" monodevelop
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i had the following error in monodevelop:

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)

how can i fix it?
to change the version doesn't works