Problem with Gimp 3 Python plug-in color_argument

[programmer_ceds]

(8 hours ago)Volker Wrote: ... 
I can't find any code errors, or do you?

Thanks in advance for your help.

If you run GIMP in a terminal window you will see the error that is preventing your script from running.

You need to call Babl.init() (just before the add_color_argument would do)

Also you need the following lines near the start of the file:

gi.require_version('Babl', '0.1')
from gi.repository import Babl