Exception:Call to undefined method UserApp::API_message in iCMS://iPHP/iAPP.php on line 292

1. iCMS::API() in iCMS://public/api.php on line 11
2. iCMS::run(NULL,NULL,NULL,"API_") in iCMS://core/iCMS.class.php on line 128
3. iAPP::run("user","message",NULL,"API_") in iCMS://core/iCMS.class.php on line 124
4. iAPP::exception("Call to undefined method UserApp::API_message","4") in iCMS://iPHP/iAPP.php on line 166