Adding require_once otherwise message constants wouldn't be loaded see #5195

main/inc/lib/message.lib.php

@@ -25,6 +25,7 @@ define('MESSAGE_STATUS_OUTBOX',				'4');
 define('MESSAGE_STATUS_INVITATION_PENDING',     '5');
 define('MESSAGE_STATUS_INVITATION_ACCEPTED',    '6');
 define('MESSAGE_STATUS_INVITATION_DENIED',      '7');
+
 /**
  * Class
  * @package chamilo.library

main/inc/lib/social.lib.php

@@ -17,6 +17,9 @@ define('SOCIAL_RIGHT_PLUGIN',       3);
 
 define('CUT_GROUP_NAME', 50);
 
+//This require is necessary becas we use constants that need to be loaded before the SocialManager class
+require_once api_get_path(LIBRARY_PATH).'message.lib.php';
+
 /**
  *
 *	@package chamilo.social