You must SSH to server as root and run following command for fix it.

cd /usr/local/cpanel/whostmgr/docroot/cgi/

rm -rf /usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/

rm -f rvsitebuilderinstaller.tar

wget http://download.rvglobalsoft.com/rvsitebuilderinstaller.tar

tar -xvf rvsitebuilderinstaller.tar

chmod 755 addon_rvsitebuilder.cgi

rm -f rvsitebuilderinstaller.tar

perl /usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/autoinstaller.cgi