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.
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.
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
set the MAXADDON from zero to 1 or more
Save the file and update the cache using