jsftp bug

jsftp_problem.js

var Ftp = require('jsftp');
var fs = require('fs');

var user = "user";
var pass = "pass";

var dd_ftp = function(uploader) {
	this.uploader = uploader;

	this.ftp = new Ftp({
	    host: "ftp.company.com",
	    port: 21,
	});	

	this.ftp.auth(user, pass, function(err, res) {
		if (err) throw err;
	});
}

dd_ftp.prototype = {
	upload_file : function upload_file(f,o, res) {
		console.log("STARTING!");
		var f_buff = fs.readFileSync(f);
		this.ftp.put(o, f_buff, function(err, data) {
			if (err) {
				throw err;
			}
			else {
				// Close FTP Connection
				this.tmp_ftp.ftp.raw.quit(function(err, data) {
					if (err) 
						throw err;
					console.log("Bye!");
					res.send("File Uploaded!");
				});

			}
		});
	},

}

exports.dd_ftp = dd_ftp;