Fixing Root Element Missing issue

What is going on here? I am consistently faced with the following error in our ASP solution shown in this screen - [login to view URL] In order to get this error users login as users with this link - [login to view URL] then they attempt to post a campaign/tweet to our system. The error seems to have possibly something to do with the Budurl API. ([login to view URL]) This program is built in C+ on ASP platform. This error only recently started occuring..the error message shows up in red font above the words "Campaign Name" on the post campaign page here - [login to view URL] Issue has been going on for little over a month and we are unable to pinpoint its source or even duplicate it. Our users just send us error notifications with that information in it from time to time. FYI a good troubleshooter could end up getting a lot more business from us.