Hi Somit,
Thanks for posting on the discussion forums. The most common solution to this error is to repair your LabVIEW installation. If you are using Windows XP you can do this by going to Control Panel, then to Add/Remove Programs, selecting the National Instruments software tab, and then the Change/Remove button. From the populated list of programs that opens in the new window you can perform a repair on your LabVIEW 8.2.1 (this may take a while and you will need the cds). I hope this helps out. Have a great day!
Regards,
Michael
Applications Engineering
National Instruments