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 I have created a Page with Event gallery to show a category list. But a 404 Category not Found error appears everytime I try to access it. I have tried everything possible to solve the problem, but really stuck. I first installed the latest version of the extension, but then downgraded to 3.9.4 which works on my other website. But it isn't working on my current website

Yes please

Finally, It worked, Perfect. Thank You Very much!!!

While working on it, now I get another error page. The main page appears without any error. But when I click on an event I get a error "0 - Call to a member function getChildren() on null". I think it's probably linked to the last one but don't know how to resolve it.

thank you for your help

I tried to rebuild as mentioned in the other article you sent, but it's still not working

It doesn't work, my whole website goes 404

I think you mean "id" and not "parent_id". It worked. It's strange, when I did it this morning my website went all on 404. But now it worked.

Thank You very much