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The CMS files are in place, but PHP dependencies in /vendor have not been installed yet.
Open Terminal in your cPanel dashboard, navigate to your domain folder, and run:
composer install --no-dev --optimize-autoloader
If your shared host has terminal access disabled, run composer install on your local computer and upload the generated vendor/ directory into this folder via File Manager.
In cPanel > Domains, ensure the document root for demo.erbhau.com is pointed to this folder (or to /public if preferring isolated public webroot).