Depending on your compiler and environment, warnings can be a pain in the backside. I searched forever on how to solve this problem and decided to solve it myself. The solution is simple and annoying as the auto generator has obviously messed up... Find the binding section in your problem file, it should look something like this: The bit that is missing is style="document".. Change your xml to look like this: Obviously use the name of your file and not Interface. Hopefully this will remove the warning.