Error loading layout, please advice how to proceed

I upgraded dash. I have a dash application with around 1000 lines of code and now get:

“Error loading layout”. As HTML output.

No error appears anywhere else. I don’t know what to do now. Any idea what is going wrong now.

The error message is alternating with “Error loading dependencies” when I reload the page.

It looks like this is causing it for example:

html.Button('Reset', id='B_reset')

Hi @mail8, could you try running your app in a fresh virtual environment with the same version of dash to see if you can reproduce the problem?

The problem disappeared. I don’t know what was causing it or how it was fixed. Maybe a browser caching problem.