int presenceType=presence.getTypeIndex();
        
        if (presenceType==P resence.PRESENCE_ERROR) {
            JabberDataBlock error=presence.getChildBlock("error");
            String mucErrCode=error.getAttribute("code");
            int errCode=0;
            try {
                errCode=Integer.parseInt(mucErrCode);
            } catch (Exception e) { return "Unsupported MUC error"; }
            ConferenceGroup grp=( ConferenceGroup)getGroup();
            if (status>=P resence.PRESENCE_OFFLINE) testMeOffline();
            if (errCode!=409 || status>=P resence.PRESENCE_OFFLINE)
                setStatus(presenceType);
            
            String errText=error.getChildBlockText("text");
            if (errText.length()>0) return errText; // if error description is provided by server
            
            // legacy codes
            switch (errCode) {
                case 401: return "Password required";
                case 403: return "You are banned in this room";
                case 404: return "Room does not exists";
                case 405: return "You can't create room on this server";
                case 406: return "Reserved roomnick must be used";
                case 407: return "This room is members-only";
                case 409: return "Nickname is already in use by another occupant";
                case 503: return "Maximum number of users has been reached in this room";
                default: return error.toString();
            }
        }