Compiling any programs from a converted project from Netexpress 5.x i become following compile error:

MSB4181 - Die Aufgabe "Cobol" hat "FALSE" zurückgegeben, jedoch keinen Fehler protokolliert. File is MicroFocus.COBOL.CurrentVersion.targets

Traduction from german: The Task "Cobol" have given "FALSE" back, but no error to protocol.

I can't find a error, compiling this with older VC will give no error!

Thanks for help

This is unfortunately caused by a Microsoft change to msbuild. If you revert back to Visual Studio 2019 15.6 then the error will not show.

The error should only show if the build fails due to another reason. Double check you don't have any other errors.