diff --git a/src/classes/logstream.class.php b/src/classes/logstream.class.php
index ef21a72..73d2da7 100644
--- a/src/classes/logstream.class.php
+++ b/src/classes/logstream.class.php
@@ -41,6 +41,7 @@ if ( !defined('IN_PHPLOGCON') )
 // --- Basic Includes
 require_once($gl_root_path . 'classes/enums.class.php');
 require_once($gl_root_path . 'classes/msgparser.class.php');
+require_once($gl_root_path . 'include/constants_errors.php');
 require_once($gl_root_path . 'include/constants_logstream.php');
 // ---