I made now tests with all my other community forums. Only those, which had a vbimport in the past have these errors.
All other XF installations with the same version numbers have no erros at all.
So this is definetly a bug in 0.03beta which only appears if you had a vbimport with that forum earlier.
@Dr.Yontem
If you want to, I can give you access to one of those forums.