I wanted to run an SSL license on my Nextcloud, but if I want to start the Cerbot to issue me a license, an error appears (picture). Can someone help me there
please read your error message. There you have all the required informations you have to fix.
I don't actually understand. The top of your screenshot mentions nginx and the nginx plugin for certbot. But afterwards it seems you're using the Apache plugin? On which webserver is your Nextcloud actually running?
What was the complete command that you ran?
Are you following some guide?