There is error message when I try to run the loadtest senarios for multiple users from Test Lab where I can see the loadtest senario under the execution grid. When I clik the run button to run this senario, a new window execution opens from where I run the laodtest senario. But it display the message "Class not registered" and fail to execute.

Please if any body know the solution or reuired some more clarification about the problem then let me know