Xmpp MUC feature not implemented

Hello guys !

I try to achieve the ‘Group Chat’ Feature

This is my deployment environment

Openfire (3.9.1)
Strophe.js (1.1.3)
strophe.muc.js (1.7.1)
XAMPP for Windows (1.8.2)

I send the request want to get xmpp namespace constants

<body rid='641581465' xmlns='http://jabber.org/protocol/httpbind' sid='189f4df8'>
          <iq xmlns='jabber:client' type='get' from='message@tkb-c0695c83280/189f4df8' to='tkb-c0695c83280' id='189f4df8'>
               <query xmlns='http://jabber.org/protocol/disco#info'/>
          </iq>
</body>

after get it response

<body xmlns="http://jabber.org/protocol/httpbind">
          <iq id="189f4df8" xmlns="jabber:client" type="result" from="tkb-c0695c83280" to="message@tkb-c0695c83280/189f4df8">
                    <query xmlns="http://jabber.org/protocol/disco#info">
                              <identity category="server" name="Openfire Server" type="im"></identity>
                              <identity category="pubsub" type="pep"></identity>
                              <feature var="http://jabber.org/protocol/pubsub#manage-subscriptions"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#modify-affiliations"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#retrieve-default"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#collections"></feature>
                              <feature var="jabber:iq:private"></feature>
                              <feature var="http://jabber.org/protocol/disco#items"></feature>
                              <feature var="vcard-temp"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#publish"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#subscribe"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#retract-items"></feature>
                              <feature var="http://jabber.org/protocol/offline"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#meta-data"></feature>
                              <feature var="jabber:iq:register"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#retrieve-subscriptions"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#default_access_model_open"></feature>
                              <feature var="jabber:iq:roster"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#config-node"></feature>
                              <feature var="http://jabber.org/protocol/address"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#publisher-affiliation"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#item-ids"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#instant-nodes"></feature>
                              <feature var="http://jabber.org/protocol/commands"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#multi-subscribe"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#outcast-affiliation"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#get-pending"></feature>
                              <feature var="jabber:iq:privacy"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#subscription-options"></feature>
                              <feature var="jabber:iq:last"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#create-and-configure"></feature>
                              <feature var="urn:xmpp:ping"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#retrieve-items"></feature>
                              <feature var="jabber:iq:time"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#create-nodes"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#persistent-items"></feature>
                              <feature var="jabber:iq:version"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#presence-notifications"></feature>
                              <feature var="http://jabber.org/protocol/pubsub"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#retrieve-affiliations"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#delete-nodes"></feature>
                              <feature var="http://jabber.org/protocol/pubsub#purge-nodes"></feature>
                              <feature var="http://jabber.org/protocol/disco#info"></feature>
                              <feature var="http://jabber.org/protocol/rsm"></feature>
                    </query>
          </iq>
</body>

I don’t see about “http://jabber.org/protocol/muc” namespace constants

Soon after , I try to use the “strophe.muc.js” and it fucntion “createInstantRoom” to send the request

<body rid='641581477' xmlns='http://jabber.org/protocol/httpbind' sid='189f4df8'>
          <iq to='tkb-c0695c83280' type='set' xmlns='jabber:client' id='1:sendIQ'>
                    <query xmlns='http://jabber.org/protocol/muc#owner'><x xmlns='jabber:x:data' type='submit'/></query>
          </iq>
</body>

and it response

<body xmlns="http://jabber.org/protocol/httpbind">
          <iq id="1:sendIQ" xmlns="jabber:client" type="error" from="tkb-c0695c83280" to="message@tkb-c0695c83280/189f4df8">
                    <query xmlns="http://jabber.org/protocol/muc#owner">
                              <x xmlns="jabber:x:data" type="submit"></x>
                    </query>
                    <error code="501" type="cancel">
                              <feature-not-implemented xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"></feature-not-implemented>
                    </error>
          </iq>
</body>

I do not know what the wrong places or missing , Please give me some feedback