PC connect to real windows phone 7 device launch app exception

The app can be launched to Emulator but to real device failed,When I debug to method RemoteApplication.Launch() lead error as below:

Microsoft.SmartDevice.Connectivity.SmartDeviceException was unhandled
  Message=0x80040202
  Source=Microsoft.SmartDevice.Connectivity
  ErrorCode=-2147220990
  StackTrace:
       at Microsoft.SmartDevice.Connectivity.RemoteApplication.Launch()
       at DeveiceAutomationTest_Desktop.DeveiceControl.ApplicationManager.InstallApplicationAndLaunch(Device deviceObj, Guid applicationGuid, String iconFileName, String xapFileName) in E:\work\WP7AutomationTest_Demo\DeveiceAutomationTest_Desktop\DeveiceControl\ApplicationManager.cs:line 29
       at DeveiceAutomationTest_Desktop.Program.Main(String[] args) in E:\work\WP7AutomationTest_Demo\DeveiceAutomationTest_Desktop\Program.cs:line 38
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: 

I refer to http://justinangel.net/WindowsPhone7EmulatorAutomation.