How To Fixed Add-On Domain Problem in Cpanel

There is an error in Cpanel hosting server that cause Add-on domain is not working properly.

Here is a various symptoms:
* When user adding add-on domain and delete it and then re-adding it again, it will show error
* Or if the domain to be added was a single user account on the same server (even after being terminated) it cant be added
* Add-on just disappear after CPANEL update

The fastest solution is :
Login into your Cpanel server with root access.