Require Once Generates Errors in Kohana v3.3.1-Collection of common programming errors

How do I require_once in my controller, a third party class that I put in kohana\vendor\twitter-api-php? I tried this answer which was similar but I kept getting errors (see below). My project’s file structure is as follows:

kohana
- application
- modules
- system
- vendor

I keep getting these errors

 Warning: Uncaught exception 'ErrorException' with message 'require_once(C:\wamp\www\kohana): failed to open stream: Permission denied' in C:\wamp\www\kohana\application\classes\Controller\Twitter.php:8 Stack trace: #0 C:\wamp\www\kohana\application\classes\Controller\Twitter.php(8): Kohana_Core::error_handler(2, 'require_once(C:...', 'C:\wamp\www\koh...', 8, Array) #1 C:\wamp\www\kohana\application\classes\Controller\Twitter.php(8): Controller_Twitter::before() #2 C:\wamp\www\kohana\system\classes\Kohana\Controller.php(69): Controller_Twitter->before() #3 [internal function]: Kohana_Controller->execute() #4 C:\wamp\www\kohana\system\classes\Kohana\Request\Client\Internal.php(97): ReflectionMethod->invoke(Object(Controller_Twitter)) #5 C:\wamp\www\kohana\system\classes\Kohana\Request\Client.php(114): Kohana_Request_Client_Internal->execute_request(Object(Request), Object(Response)) #6 C:\wamp\www\kohana\system\classes\Kohana\Request.php(986): Kohana_Request_Client->execute(Object(Request)) #7 C:\wamp\www\kohana\index.p in C:\wamp\www\kohana\application\classes\Controller\Twitter.php on line 8

and this error

Fatal error: Controller_Twitter::before(): Failed opening required '' (include_path='.;C:\php\pear') in C:\wamp\www\kohana\application\classes\Controller\Twitter.php on line 8

Here is my code

Originally posted 2013-11-27 12:25:22.