Error in LR

Hi, i have one qtp script...i wann to do load testing for qtp script so i opened an vb script vuser protocol in lr and i pasted that qtp script in the action section.while i running the script i got the following error!!!

Virtual User Script started
Starting action vuser_init.
Return code = 0 (DONE)
Ending action vuser_init.
Running Vuser...
Starting iteration 1.
Starting action Action.
[COLOR="Red"]Error: Error : Action.vbs (9) : column 0 : Type mismatch: 'Browser' , err # = 13[/COLOR]
Ending action Action.
Ending iteration 1.
Ending Vuser...
Starting action vuser_end.
Return code = 0 (DONE)
Ending action vuser_end.

If know how to solve the error,reply to thread as soon...

Thanks in advance

krish