This setup makes my nextcloud instance unreachable

[ristein]

Hi,
someone please help me out here:
I have Ubuntu and apache, nextcloud running already via a nextcloud.conf containing this:
nextcloud.conf

Alias /nextcloud "/var/www/nextcloud/"

<Directory /var/www/nextcloud/>
  Require all granted
  AllowOverride All
  Options FollowSymLinks MultiViews

  <IfModule mod_dav.c>
    Dav off
  </IfModule>
</Directory>

But when adding this code given here into an onlyoffice.conf, I will get an "Internal Server Error" in Nextcloud, other sites are still working fine.
If I comment following lines, no error appears:

#  User daemon
#  Group daemon

Are these lines necessary? How can I go on?