Hello,
I'm afraid I cannot be of much help without more information. What development system are you using? You're in the Instrument Connectivity/GPIB forums, do you think that your problem somehow relates to GPIB? What is the exact error message? Do you have the appropriate LabVIEW (or CVI) runtime engine installed? (I'm assuming you're developing using some National Instruments product?) The RTE (Run Time Engine) for different products is downloadable on the support page for the appropriate development system.
Scott