Internal server error
Could not fetch uid or gid for : cpanel-phpmyadmin

Verify user cpanel-phpmyadmin exists by command
[root@server ~]#grep cpanel-phpmyadmin /etc/passwd

If it doesn’t exist then add user cpanel-phpmyadmin
useradd cpanel-phpmyadmin -d /var/cpanel/userhomes/cpanel-phpmyadmin

Now, assign appropiate ownership to /var/cpanel/userhomes/cpanel-phpmyadmin
chown cpanel-phpmyadmin.cpanel-phpmyadmin /var/cpanel/userhomes/cpanel-phpmyadmin -R

Restart mysql and try once again to access phpmyadmin.

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