Problem in using MiniFuzz on Windows XP or Server2003

Hi ,
I receive an error message when using MiniFuzz on Windows XP or Server2003 on my current command . Why is this happen ?

Error message:
Unhandled exception has occurred in your application . If you click Continue , the application will ignore this error and attempt to continue . If you click quit , the application will close immediately . Object reference not set to an instance of an object .
