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Server Responded with an error

#1
Hello !

I want to create a code event Listener !
But I can't create because I have this error when I want to save : "The server responded with an error. The error message is in the JavaScript console."

Here is my php file :
PHP:
<?php

class MessagesPredefinis_Listener
{
    public static function templateHook($hookName, &$contents, array $hookParams, XenForo_Template_Abstract $template)
    {
       if ($hookName == 'forum_list_nodes')
        {
           switch($hookName)
            {
               case 'forum_list_nodes':
                   $messagesPredefinis = template->create('messages_predefinis', $template->getParams());
                    $contents = $messagesPredefinis . $contents;
                    break;
            }
        }
    }
}
Thanks