Application Error. Error: invalid command name {random characters}

[m92rizk]

Hello,

The main issue I am facing with this error (image) is its randomness, as I can't seem to catch how and when it pops up and kills the whole application. Sometimes it appears, and sometimes it doesn't. Hope you can help me!
this is the associated error in terminal:

Traceback (most recent call last):
File "./gui_threaded_ctk_3.py", line 1616, in
app.mainloop()
File "---\Python\Python37\lib\site-packages\customtkinter\windows\ctk_tk.py", line 165, in mainloop
super().mainloop(*args, **kwargs)
File "---\Python\Python37\lib\tkinter_init_.py", line 1283, in mainloop
self.tk.mainloop(n)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 22: invalid start byte

I am trying to build a GUI that has the following:

• tabview
• popup window
• buttons
• segmented buttons
• scrollbars (that updates appearance and size based on window size and content size)
• some widgets are stored in lists, to be called later in a for loop to be configured.

that's what I remember for the moment, but i am happy to cooperate to figure this out.

Thank you,