Invoke Visual Basic, getting started

the problem starts by try to get results from the examples of the SAPBCIntegratorGuide. Is anybody out there to help me fix the problem “win32.COM.WmDispatchException: Invalis class string.Error Code 800401f3”? everything checked but nothing runs… i like to get “helloWorld”
thanks max

it runs on 4.0.1 server sp4