aSmack Listener & IQ Provider Problems

Hi guys.the provider executing the listener does not work.

Register listeners;

mGetListenPackets(xmppconn,new PacketTypeFilter(IQ.class));
mGetListenPackets(xmppconn,new PacketTypeFilter(Presence.class));
mGetListenPackets(xmppconn,new PacketTypeFilter(org.jivesoftware.smack.packet.Message.class));
ProviderManager.getInstance().addIQProvider(Ping.ELEMENT, Ping.NAMESPACE, new PingProvider());
ProviderManager.getInstance().addIQProvider(Provider.element_name, Provider.namespace,new Provider()); 

i catch custom iq packets but listener does not work.

@Overridepublic IQ parseIQ(XmlPullParser xpp) throws Exception {          int eventType = xpp.getEventType();          PvCommand pvCommand = null;          String currentTag = null;          while (eventType != XmlPullParser.END_DOCUMENT) {                     if (eventType == XmlPullParser.START_TAG) {                              currentTag = xpp.getName();                              if (xpp.getName().equalsIgnoreCase("pvcommand")) {                                         pvCommand = new PvCommand();                               }                              }elseif (eventType == XmlPullParser.END_TAG) {                                        currentTag = null;                                        if (xpp.getName().equalsIgnoreCase("pvcommand")) {                                                  // custom iq send dispatcher method                                                  iqPacketDispatcher(pvCommand);                                                  pvCommand = null;                                        }                              }elseif (eventType == XmlPullParser.TEXT) {                                          if (currentTag != null) {                                                  if (currentTag.equalsIgnoreCase("sendClassName")) {                                                            pvCommand.setSendClassName(xpp.getText());                                                  }elseif (currentTag.equalsIgnoreCase("sendMethodName")) {                                                            pvCommand.setSendMethodName(xpp.getText());                                                  }elseif (currentTag.equalsIgnoreCase("spvcommand")) {                                                            pvCommand.setSpvCommand(xpp.getText());                                                  }                                        }                              }                              eventType = xpp.next();                    }                      returnnull;          }  

i add break in provider.listener worked.but server send error packet.

help me please.