:action/* element is giving missing controller error

here is my route.php file when i try to access website/blog it would throw me an error saying blog controller is missing. but when i change "/blog/:action/*" to "/blog" it wil work fine what am i doing wrong ?? please help thanks.

<?php  Router::connect('/', array('controller' => 'pages', 'action' => 'display', 'home'));  /**  * ...and connect the rest of 'Pages' controller's URLs.  */  Router::connect('/pages/*', array('controller' => 'pages', 'action' => 'display'));  Router::connect('/blog/:action/*', array('controller' => 'posts', 'action' =>'index'));  /**  * Load all plugin routes. See the CakePlugin documentation on  * how to customize the loading of plugin routes.  */  CakePlugin::routes();    /**  * Load the CakePHP default routes. Only remove this if you do not want to use  * the built-in default routes.  */  require CAKE . 'Config' . DS . 'routes.php';  ?>

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