Updated AbstractGeneratorConfig error messages
Updated AbstractGeneratorConfig error messages

codeaudit/myriad-toolkit,TU-Berlin-DIMA/myriad-toolkit,codeaudit/myriad-toolkit,TU-Berlin-DIMA/myriad-toolkit,TU-Berlin-DIMA/myriad-toolkit,codeaudit/myriad-toolkit,codeaudit/myriad-toolkit