Codeigniter “No input file specified.” error when submitting form?

[eluser]ErinKabbash[/eluser]
I have Googled the issue and posted to multiple forms. Can you please describe the solution? I have tried to change my .htaccess file as suggested on Google and also tried to edit the config.php file as stated on Google. Neither seems to fix the issue?

My .htaccess is (Includes the ? after index.php as suggested on google)..

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*) index.php?/$1

In my config.php I have..

$config['base_url'] = 'http://mysite.com';
$config['index_page'] = "";
$config['uri_protocol'] = "AUTO";