Beta Visual Designer - Given key was not present in dictionary

Are you able to reproduce it? If yes then please enable logs: https://www.b4x.com/android/forum/threads/intermittent-error-message.9047/#post-50478 and post the logs.

Erel said:

Are you able to reproduce it?

Click to expand...

I failed to reproduce it.

I managed to reproduce the error.
It arose when I changed the name of a button in the Visual Designer.
I saved the project after making the change and attach the zip.
I created a log and attach it.
The project now gives an error when opening the layout, which it didn't do before I made the change.

Have you updated to v5.01: https://www.b4x.com/android/forum/threads/54837/#content

It should fix this issue.