Constantly threw errors at me for using c_dkgrey instead of c_dkgray. Stopped immediately when I used c_dkgray. Happens with c_ltgrey and c_ltgray too

Some of the British English constant names were only added in a recent update, which is why the extension is not aware of them yet - there is no way to support these without cutting off support for using GMLive with previous GM updates.

You can get around this by doing

live_constant_add("c_dkgrey", c_dkgrey);

in obj_gmlive’s Create event.