I have not made any significant changes, but I am suddenly receiving this error message. I added the statement "from dash import callback’ to each page with callbacks when I converted my app to a multi-page app days ago.
It has worked fine, more or less, as a multi-page app since then.
A search of this platform for this message produced no results, and a Google search search produced no results for this message either. I just don’t know what could cause it, so I have to ask a general question.
I am hoping maybe someone out there has tangled with his one already and knows the answer?
Here is a copy of the entire Traceback message.
It does not reference a page or line number in my code, though it does reference the init.py page in the Dash site package. That does not leave me with much of a starting point.