Once you finished running RVsitebuilder installation in SSH, and access to WHM -> RVglobalsoft Manager -> RVsitebuilder to Setup, but you got the following error.
Your problem may have the problem on pear package, on the disable_functions
So, please try the following solution.
1. Edit dit file /usr/local/lib/php.ini by removing PHP function popen, ini_set
Then the server will be able to be installed pear package and setup successful.
2. Setup pear again
3. Restart apache
4. Install RVSB again.https://www.rvsitebuilder.com/installation