There was a problem creating the addon domain.
Sorry, you are not allowed to add any more than (0) addon domains! The domain below was not setup.
Reason:
The domain is not allowed to host any add-on domains on it and the addon domain resources are set to zero by the administrator of the server. You won’t be able to add add-on domain OR park domain from cPanel and receives the “Sorry, you are not allowed to add any more than (0) addon domains!” error message.
Solution:
You need to change add-on domain resources from zero (0) to 1 or more. There are 2 methods to increase the add-on domains for an account:
1. Login to WHM as root, goto Account Functions >> Modify an Account >> select the domain name from the domain’s list and click ‘Modify’ >> specify the number of add-on domains in “Max Addon Domains” text box >> click Save.
2. Login to your server as root. Edit the users file
nano /var/cpanel/users/username
set the MAXADDON from zero to 1 or more
MAXADDON=1
Save the file and update the cache using
/scripts/updateuserdomains