What´s your hosting? if is hostgator you need add your user.
Try this
RewriteEngine On
RewriteBase /mvc
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /mvc/index.php/$1 [L]
if your hosting is hostgator you need add you name user, for example
RewriteEngine On
RewriteBase /~<name_user>/%{HTTP_HOST} <or> <your folder>
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /~<name_user>/%{HTTP_HOST} <or> <your folder>/index.php/$1 [L]