[SOLVED] 404 error page not showing?

Hi,

got the following issue, Contao 3.5.28: I got an error page for 404 and 403 errors, but it won't show, no matter what I do.

It's in the backend Attachment 185, it's in the htaccess

Code:

---

### Umleitung ERROR DOCUMENT
ErrorDocument 403 https://www.example.de/error-403.html
ErrorDocument 404 https://www.example.de/error-404.html

---

but I still get "access denied" errors. :( :( :(

K, problem solved. Found the same problem and the solution for it on github.

What was the cause and the solution?