Error when loading old UI files in the updated designer

[LalFX]

First let me thank you for the excellent implementation of both extensions - they have been a life saver in my journey through Python.

The issue I am facing is that after upgrading to the 0.26 version of pygubu-designer, whenever I open the old UI file with menu, I get an error . Without the menu, I get a <NoneType" object has no attribute 'destroy'> error.

I tried unistalling and reinstalling pygubu, vscode etc. and still get the same error. Creating a new UI has no issues.

When I downgraded to v0.20 there was no issue in opening the old file. The issue persisted in v0.25 etc.

I am new to python and I could be missing something very simple.

This is the UI code

This is the Python code

This is the error I get on opening the UI file:

[alejandroautalan]

First let me thank you for the excellent implementation of both extensions - they have been a life saver in my journey through Python.

Hello @LalFX thank you for your words. I'm glad that pygubu is useful to you.

I found the bug and will fix it ASAP. Thanks for the report.

Regards
Alejandro A.