Error during using UI Builder

Server Code Codeless
1

Hi

When I was almost ready to finish the logic of this page I found this error.

Screenshot 2023-03-28 at 13.19.39
Screenshot 2023-03-28 at 13.19.391263×369 75.1 KB

Any idea how to solved and continue? This page was time consuming to finished.

Thanks, Mario

2

I make a copy of the page and works fine, then clear the old one.

Thanks, Mario