Urgent queries should be directed to Plesk support.
1. Does the new.virtualserver.ch domain exist?
2. Is caching enabled for new.virtualserver.ch?
3. You could manually edit the conf. file and remove the offending directives to get NGINX working.
hello @orgolan
there's not enough details regarding errors.
you have to check logs (/var/log/nginx/error.log and journalctl -xe -u nginx )
I suppose at /etc/nginx/nginx.conf:41 some configs included. Most probably you need to find some file in nginx configs with name new.virtualserver.ch* and remove them (or temporary move to some location like /tmp/) and restart nginx.
In general if you will not able to find the reason it would be faster and better to contact Plesk Technical Support.