software using tkinter no longer starting up

[mbohets]

Recently, my favorite card game does not start anymore, any ideas on how to solve this ?
When I launch it from the terminal, I get following errors:

pysolfc
Traceback (most recent call last):
File "/usr/games/pysolfc", line 28, in <module>
init()
File "/usr/share/games/pysolfc/pysollib/init.py", line 93, in init
root = tkinter.Tk(className=pysollib.settings.TITLE)
File "/usr/lib/python3.8/tkinter/__init__.py", line 2261, in __init__
self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk,
sync, use)
_tkinter.TclError: unknown color name "BACKGROUND"
Error in sys.excepthook:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 153, in apport_excepthook
with os.fdopen(os.open(pr_filename,
FileNotFoundError: [Errno 2] No such file or directory: '/var/crash/_usr_share_games_pysolfc_py
sol.py.1000.crash'

Original exception was:
Traceback (most recent call last):
File "/usr/games/pysolfc", line 28, in <module>
init()
File "/usr/share/games/pysolfc/pysollib/init.py", line 93, in init
root = tkinter.Tk(className=pysollib.settings.TITLE)
File "/usr/lib/python3.8/tkinter/__init__.py", line 2261, in __init__
self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk,
sync, use)
_tkinter.TclError: unknown color name "BACKGROUND"