title: XMPPError: registration-required - auth
body: <p>when i am join room i am getting exception given below.</p>
  
  <blockquote>
    <p>org.jivesoftware.smack.XMPPException$XMPPErrorException: XMPP error
    reply received from fuu@conference.103.31.81.74/aq: XMPPError:
    registration-required - auth</p>
  </blockquote>
  
  <pre><code>multiUserChat.join(nickname, password);
  </code></pre>