Make error message less ambiguous
Make error message less ambiguous

https://bugzilla.gnome.org/show_bug.cgi?id=625095

Distrotech/pygobject,pexip/pygobject,nzjrs/pygobject,alexef/pygobject,alexef/pygobject,davidmalcolm/pygobject,GNOME/pygobject,MathieuDuponchelle/pygobject,jdahlin/pygobject,MathieuDuponchelle/pygobject,davibe/pygobject,jdahlin/pygobject,sfeltman/pygobject,GNOME/pygobject,thiblahute/pygobject,Distrotech/pygobject,nzjrs/pygobject,sfeltman/pygobject,davibe/pygobject,nzjrs/pygobject,thiblahute/pygobject,jdahlin/pygobject,Distrotech/pygobject,MathieuDuponchelle/pygobject,GNOME/pygobject,choeger/pygobject-cmake,davidmalcolm/pygobject,Distrotech/pygobject,pexip/pygobject,thiblahute/pygobject,davibe/pygobject,davibe/pygobject,sfeltman/pygobject,alexef/pygobject,pexip/pygobject,choeger/pygobject-cmake,davidmalcolm/pygobject,choeger/pygobject-cmake