Blank page after failed Certificate application

Hello dear community,
I fear I made a grave error and are in need of help.

I wanted to acquire a certificate for my DNS to my Nextcloud, but had issues with let’s Encrypt.
Therefore, I looked for alternatives and ended up trying zerosll through the command line with this:
as my guide.

But instead a smooth process I got a bunch of errors

After this I had still no https, but instead was greeted by a blank page when I tried to access the cloud, the default apache2 test Website still works. Brave also showed an Error 500. But the nextcloud.log say nothing about an Issue recently.

I tried removing acme to get rid of the problem, but this did not work and quite frankly I have as little experience with Nextcloud and Servers to solve it by myself.

Help would be appreciated :slight_smile: