Our tuner ran into issues when he attempted to load up his VTS to tune a car and found this nasty error. I found that the error has to do with XML, so I looked in the VTS folder and saw that there were 3 XML configuration files. Through the process of elimination I found that our particular error was located in the popout menu configuration file. You can safely move/delete all 3 of these files, as they will be re-generated on next startup (Keep in mind that you may lose your configuration settings, however). After removing the file, VTS started up and opened our file cleanly with no errors!
Hope this helps someone else.
