Error from park wrapper: check..

Error from park wrapper: domain.name is already configured.

OR

Unable to find out which user owns the parked domain domain.name.
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#grep username /etc/trueuserdomains

If there is entry remove.

cd /var/cpanel/users/
grep -rl parked_domain .

If any files is listing it, remove from that file.

grep parked_domain /usr/local/apache/conf/httpd/conf

If listed remove it. Then add park domain from cpanel.