Apache 2.2.17 on CentOS 5.2.

I am attempting to pressure SSL for any specific directory. Each of the solutions below create a 500 Internal Server Error on my small system. What is wrong? There is no other rules within the htaccess. The htaccess is situated within the target directory.

RewriteEngine On
RewriteCond %{SERVER_PORT} !443
RewriteRule (.*) https://www.example.com/require-secure/ [R]

And

RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}

Thanks