Thank you! I fixed it! but it gives another error that can't assign ip to userPlease keep text in English also in your posts.
Check the /etc/virtual/domains and domainowners files if the domain and/or users are still in there.
Also check /usr/local/directadmin/data/users if the username is indeed deleted from there same for the /home directory.
-rw------- 1 diradmin diradmin