I'm not sure, it could be anything, of course, maybe even a damaged file, but I've once had problems with level changing, too, and as far as I remember the source was a global function started within an entity action. The error message should point to that function, though, so I guess you can ignore my post. Sorry.
"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual
