issue in calling sendAmf0EncCmdMsg

[symd]

I am trying to use this library for creating a client application. when i created the following code, I'm getting TypeError: undefined is not a function for sendAmf0EncCmdMsg function call.

var rtmpchunk= require('./rtmpChunk.js');
msgchunk=new rtmpchunk(opt);
var object=prepareConnectCommand();
msgchunk.sendAmf0EncCmdMsg(object);