CI On Subdomain Configuration?

CI is giving me an error: An Error Was Encountered - Unable to locate the model you have specified: Appointment

This works fine on localhost, and yes the database.php is configured properly.  My thought was CI was looking for the file in the wrong place, possibly on the primary domain.  Don't know if this has something to do with mod rewrite rules.  Those are:

Code:

<IfModule mod_rewrite.c>
   RewriteEngine On
   RewriteBase /

   #Removes access to the system folder by users.
   #Additionally this will allow you to create a System.php controller,
   #previously this would not have been possible.
   #'system' can be replaced if you have renamed your system folder.
   RewriteCond %{REQUEST_URI} ^system.*
   RewriteRule ^(.*)$ /index.php?/$1 [L]
   
   #When your application folder isn't in the system folder
   #This snippet prevents user access to the application folder
   #Submitted by: Fabdrol
   #Rename 'application' to your applications folder name.
   RewriteCond %{REQUEST_URI} ^application.*
   RewriteRule ^(.*)$ /index.php?/$1 [L]

   #Checks to see if the user is attempting to access a valid file,
   #such as an image or css document, if this isn't true it sends the
   #request to index.php
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteCond %{REQUEST_FILENAME} !-d
   RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule>

<IfModule !mod_rewrite.c>
   # If we don't have mod_rewrite installed, all 404's
   # can be sent to index.php, and everything works as normal.
   # Submitted by: ElliotHaughin

   ErrorDocument 404 /index.php
</IfModule>