Setup RVsitebuilder 6 in WHM never completes, problem on ioncube loader

If you're facing problem on RVsitebuilder 6 Setup in WHM. You can check and fix it by following.

Check error log:

tail -f /usr/local/cpanel/logs/error_log

PHP Fatal error: Uncaught Error: Call to undefined function dl() in /usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/ioncLoader.php:83

Stack trace:

#0 /usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/index.php(19): require_once()

Solution:

WHM > Tweak setting > cPanel PHP loader on save

WHM > Plugin > Rvsitebuilder /manager > Setup Rvsitebuilder again