It will automatically create remote access key on your server. Just access to it, don't need to generate the new key. After that try to setup it again via RVglobalsoft Manager -> Theme Manager.
rm -f /usr/local/cpanel/Cpanel/rvversion
perl /root/rvadmin/auto_rvskin.pl
Please verify that the key in the file /root/.accesshash and /usr/local/cpanel/Cpanel/rvwhmkey is identical. And check the error on /usr/local/cpanel/logs/error_log
ls -al /usr/local/cpanel/Cpanel/rvwhmkey
ls -al /usr/local/cpanel/Cpanel/rvbin
more /usr/local/cpanel/Cpanel/rvwhmkey
more /root/.accesshash