unable to remove .php from file extension with .htaccess

I have the following in my .htaccess file. Redirecting the www. works perfectly, as does the custom 404 message. The removal of .php from the file extension fails to work. returns the 404 message, with working fine.

RewriteEngine On
RewriteBase /

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

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^([^\.]+)/$ $1.php

ErrorDocument 404 /404.php

Also if it helps this is in my 000-default.conf filed

        <Directory /var/www>
                Options Indexes FollowSymLinks MultiViews
                AllowOverride All
                Order allow,deny
                allow from all

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Turns out it was multiviews that was causing the problem. After I checked the error logs and searched on the error message I was receiving I found the following article.