php - Redirecttion error in .htaccess

I have this in my .htaccess file:

RewriteCond %{HTTP_HOST} ^example.com$ [NC]

RewriteRule (.*) http://www.example.com/$1 [R=301,L] 

It should work fine but give me error

http://www.website.com/public_html/
Not Found

The requested URL /public_html/ was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an Error Document to handle the request.

Answer

The root ispublic_html so www.website.com goes to that folder as the document root.