[WD20] Project is using native accesses, wich is not available in integrated framework ??

Hi,

today i opened my project and i got the compilation error "The project is using native accesses, which is not available in integrated framework":



I never saw this error before, as i ended work yesterday this error was not there. Where does it come from, what does it mean? I can't doubleclick the message, it just says the error would be in line 1, col 1. But there is only "Extern "KeyConst.WL"":



What can i do to fix this error?

Thanks and greetings
Markus