Page not found for Multipage app when running the code as a module

[plotplot]

Thank you very much @AnnMarieW .
I started new thread with example here:

Using plotly dash + pages + dcc.Tab - page referencing not working

Hi there, am new to dash and pages and think there is something fundamental I have not understood yet. I am trying to build an app struction with several tabs, whereas I can populate the tabs with content contained in seperate .py files. I want my app.py to be as sleek as possible. My code produces the app and the tabs, but each tab displays the error “Page ‘page1’ not found” respectively because the entry in the registry is not found. Could you help me figure this out? Below is my code: ap…