Website error Not found RVSiteBuilder CMS App in .:/opt/alt/php73/usr/share/pear and Redirect non-www

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 7.3+

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.

In .htaccess

Go to cPanel -> File Manager

At /home/{user_name}/public_html/.htaccess

#Redirect domain to use HTTPS
RewriteEngine On
RewriteCond %{SERVER_PORT} 80 [OR]
RewriteCond %{HTTP_HOST} ^www\.yourDomainName\.com [NC]
RewriteRule ^(.*)$ https://yourDomainName\.com/$1 [R=301,L]

#Redirect domain to use HTTP
RewriteEngine On
RewriteCond %{SERVER_PORT} 80 [OR]
RewriteCond %{HTTP_HOST} ^www\.yourDomainName\.com [NC]
RewriteRule ^(.*)$ http://yourDomainName\.com/$1 [R=301,L]