As title, mainly find references include: atk - sharp, GDK - sharp, glade - sharp, glib - sharp, GTK - sharp, pano - sharp; If remove these references (GTK removed prompts can no longer do interface design), to add references to The corresponding other versions of The DLL, you will be prompted "Error MSB4019: The imported project"/home/PI/cache/views/7.0/MSBuild/21598 _1//Microsoft CSharp. Core. The targets "was not found.", could you tell me which related experience, to provide The help, thank you!