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

main/inc/lib/message.lib.php

@@ -23,8 +23,9 @@ define('MESSAGE_STATUS_UNREAD',				'1');
 define('MESSAGE_STATUS_DELETED',                '3');
 define('MESSAGE_STATUS_OUTBOX',                 '4');
 define('MESSAGE_STATUS_INVITATION_PENDING',     '5');
-define('MESSAGE_STATUS_INVITATION_ACCEPTED','6');
+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