This error is thrown in WHM when accessing RVSiteBuilder. In cPanel RVSiteBuilder brings blank/empty page.
Fatal error: Call to undefined method DB_DataObject_Error::find() in /var/cpanel/rvglobalsoft/rvsitebuilder/modules/sitebuilder/classes/SitebuilderDao/CharsetDao.php on line 124
The fix provided by RVSiteBuilder team is
If this folder is empty /var/cpanel/rvglobalsoft/rvsitebuilder/var/cache/entities/ then run this command
/usr/local/cpanel/3rdparty/bin/php /var/cpanel/rvglobalsoft/rvsitebuilder/etc/rebuildDataobjects.php
This worked.