I have met problem which I made by myself, but now can’t repair this.
I was installing idle (python ide) and when app was launched changed background color, and now when I try to run idle I get this:
Traceback (most recent call last):
File “/usr/bin/idle”, line 5, in
File “/usr/lib/python3.9/idlelib/pyshell.py”, line 1477, in main
root = Tk(className=“Idle”)
File “/usr/lib/python3.9/tkinter/init.py”, line 2262, in init
self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: unknown color name “#282a36”
I think main problem lies in this →  which is for transparency.
How repair this color?
I found settings of idle in ~/.idlerc/config-main.cfg but there is nothing helpfull there. Deleting this file wont help neither.