运行单元测试时出现IOException

Question

正在运行单元测试时，出现以下错误。为什么会出现任何线索？

System.IO.__Error.WinIOError(Int32 errorCode, String str)
System.IO.Directory.InternalCreateDirectory(String fullPath, String path)
System.IO.Directory.CreateDirectory(String path)
Microsoft.VisualStudio.SmartDevice.TestHostAdapter.DeviceAgent.DeviceSerializableTestContext.SetupTestFolders()
Microsoft.VisualStudio.SmartDevice.DeviceHostAdapter.DHAServer.RunTest(String serializedUnitTestElement)
Microsoft.VisualStudio.SmartDevice.DeviceHostAdapter.DHAServer.ExecuteCommand(Object obj)
System.Threading.ThreadPool.WorkItem.doWork(Object o)
System.Threading.Timer.ring()