That can happen, if you have special characters (like german umlauts, french accents, scandinavian Ø, most likely also chinese and cyrillic letters) in the filenames (or the path), where the error occurs.
The get not parsed by the regexes.
You can change this behaviour by changeing the regexes C::B use under "Settings -> Compiler and debugger... -> Global compiler settings -> [the compiler you use] -> Other settings(rightmost tab) -> Advanced options... -> Output parsing".
This cannot easily be done for every possible language (at least not by the C::B developers), and would not make sense for the most users, so only the standard characters are included here.