How to correct the error for addon domain not getting listed in cpanel?
Refer the following steps:-
1) Login to WHM >> Dns Functions >> Delete a DNS Zone
Delete the addon domain’s zone in question.
2) Login to the server as root user and delete the virtual entry for the same addon domain from the /etc/httpd/conf/httpd.conf
3) Login to the Cpanel and add the addon domain with same directory name as it was earlier..