I receive http 400 error running script in controller, but do not receive http 400 running in vugen

Hi, I created a simple testscript to run a report in livleink, I use web_set_user_ function to set the user to run the load test and the ran with 20 vusers. I did not recieve any http errors when running in vugen but when running in controller I received http 400 errors, but no issues with running the report itself...it ran ok and no errors were detected, just the http 400 errors which did not effect the outcome of running the report.

I just want to understand why the http 400 errors occured, but the report still ran ok?

any help would be appreciated.

thanks,

James