Hi,
I have the same issue. But different cause of this error.
I used the theme “Travelfy” then changed to another one “Writee”
The menu drop down using categories and the pages that pulled the posts marked with categories worked on the first theme. But this set up doesn’t work on the new theme. In fact even if I click on any category indicated in the post – I’m getting the blank page with error message, that the page has been removed.
I tried to add new posts and new categories, but seems not to work.
Would appreciate the advise on what went wrong.
Thank you,
Victoria