Hello,
I think I may have just replied to your other host, don't know if this is the same problem or a different but I'll assume this is different.
For this problem, it sounds as though your permissions are improper. To correct this log into SSH and use the following comands
chown username:username /home/username/domains/domain.com/public_html
chmod 711 /home/username/domains/domain.com/public_html
Replacing the username, domain.com with the value of the domain and username with the error.
Hope this helps.