Ошибка в уведомлением на почту при новом ЛС

if (!$inUser->isOnline($to_id) && $needmail){
 
			$postdate   = date('d/m/Y H:i:s');
			$to_email   = $this->inDB->get_field('cms_users', "id='{$to_id}'", 'email');
			$from_nick  = $inUser->nickname;
			$answerlink = HOST.'/users/'.$to_id.'/messages.html';
 
			$letter = cmsCore::getLanguageTextFile('newmessage');
			$letter = str_replace('{sitename}', $inConf->sitename, $letter);
			$letter = str_replace('{answerlink}', $answerlink, $letter);
			$letter = str_replace('{date}', $postdate, $letter);
			$letter = str_replace('{from}', $from_nick, $letter);
			$inCore->mailText($to_email, $_LANG['YOU_HAVE_NEW_MESS'].'! - '.$inConf->sitename, $letter);
 
			return true;
		}

 $user_letter = str_replace('{answerlink}', HOST.$item['link'], $user_letter);