Website error Not found RVSiteBuilder CMS App in .:/opt/alt/php73/usr/share/pear

Error:

Not found RVSiteBuilder CMS App in .:/opt/alt/php73/usr/share/pear
Please contact your provider with info:
1. RVSitebuilder CMS App have not install.
2. Not found vendor path.
3. Your PHP version not compatible, Our system require PHP 7.1+

Reason:

To publish website to a domain without www it will not mean to be effect to the one with www, but you can fix it in your control panel.

Solution:

To make your website to be called both with and without www, you can set a redirect from the other to the main one in cpanel.

Go to cPanel -> File Manager -> DOMAINS -> Redirects.

Or in .htaccess file at

RewriteEngine on
RewriteCond %{HTTP_HOST} ^www.example.com [NC]
RewriteRule ^(.*)$ http://example.com/$1 [L,R=301,NC]