that._buildBody is not a function

[a92c]

When click the button.. Show this log... that._buildBody is not a function:
Code:

goToRegister() {

    var connection = new Strophe.Connection(
//          "http://bosh.metajack.im:5280/xmpp-httpbind");
      "http://192.168.179.131:7070/http-bind");

    var callback = function (status) {alert(status);
      if (status === Strophe.Status.REGISTER) {
        connection.register.fields.username = "fghdfhg";
        connection.register.fields.name = "dfgfdgfdg";
        connection.register.fields.password = "dfddfgfdg";
        connection.register.submit();
      } else if (status === Strophe.Status.REGISTERED) {
        console.log("registered!");
        connection.authenticate();
      } else if (status === Strophe.Status.CONNECTED) {
        console.log("connesso!");
      } else if (status === Strophe.Status.DISCONNECTED) {
        console.log("Disconnected from XMPP-Server");
      }
    };

//    connection.connect(data.jid, data.password, callback);
    connection.register.connect("ubuntu.com", callback, 60, 1);
  }

[sualko]

Please post your full error log and try to describe your issue in more detail.