This is something that only the helpdesk can assist you with. (http://igpmanager.com/account/helpdesk)
But before you go there, have you tried to do anything different when you encounter the response? Anything like trying a different browser, or disabling AdBlock, resetting your internet connection, restarting your computer, etc.?
Also, can you provide a screenshot of the error message? I think you may have meant "Invalid Request".