moc

I got the same error once , maybe source of your problem is different but I will write anyways. In my *.pro file, it was like : SOURCES += main.cpp\ mainwindow.cpp\ serialHelper.cpp \ serialHelper.cpp HEADERS += mainwindow.h\ += serialHelper.h \ serialHelper.h \ typeDefinitions.h cpp and header file was repeating itself. I delete the repeating includes … Read more