diff --git a/src/oauth2server/Server.php b/src/oauth2server/Server.php
index 3819e713..4560599b 100644
--- a/src/oauth2server/Server.php
+++ b/src/oauth2server/Server.php
@@ -10,6 +10,15 @@ class OAuthServerException extends Exception {}
 
 class Server
 {
+    protected $errors = array(
+        'invalid_request'   =>  'The request is missing a required parameter, includes an invalid parameter value, includes a parameter more than once, or is otherwise malformed.',
+        'unauthorized_client'   =>  'The client is not authorized to request an access token using this method.',
+        'access_denied' =>  'The resource owner or authorization server denied the request.',
+        'unsupported_response_type' =>  'The authorization server does not support obtaining an access token using this method.',
+        'invalid_scope' =>  'The requested scope is invalid, unknown, or malformed.',
+        'server_error'  =>  'The authorization server encountered an unexpected condition which prevented it from fulfilling the request.',
+        'temporarily_unavailable'   =>  'The authorization server is currently unable to handle the request due to a temporary overloading or maintenance of the server.'
+    ); 
 
     public function __construct()
     {