Error from park wrapper: yourdomain is already configured

Error from park wrapper: yourdomain is already configured while you are adding addon domain through cpanel.

Once you are getting this error, we have to manually remove the particular domain from the following location and retry again from your cpanel to add that domain as addon domain

1. /etc/httpd/conf/httpd.conf
2. /etc/userdomains
3. /etc/named.conf
4. cd /var/named/ domain.com.db file delete
5. /etc/localdomains
6. /etc/valiases/
7. /etc/vdomainaliases/
8. /etc/trueuserdomains
9. /etc/trueuserowners
10 /etc/vmail/
11 cd /var/cpanel/bandwidth/

Still your cpanel is showing this error we have to add our domain.com manually into these files. While adding you have to take back of all those important files.
[httpd.conf , named.conf , userdomains etc ]

Or some times you may get the error like
Error from park wrapper: domain.com is owned by another user

Try the above fix , this is not fixed Go to WHM -> Server Configuration -> Tweak Settings
enable "Allow Creation of Parked/Addon Domains that are not registered"
After that go to "/var/cpanel/cpanel.config" add "autocreateaentries=0" and save your file

All your comments are valuable to me ...