when i try to define variables in variablepane, after saving the file and open it again, it shows an error message as shown in attached image.

Your environment
- OS: [windows 11]
formation Version 0.6.2
- Python version: [3.9]
- tk version: [8.6]
but i found out that when i open xml and change the window tag from tkinter.Tk to tkinter.Frame it works fine.
when i try to define variables in variablepane, after saving the file and open it again, it shows an error message as shown in attached image.

Your environment
formationVersion 0.6.2but i found out that when i open xml and change the window tag from tkinter.Tk to tkinter.Frame it works fine.