"Invalid `api_key` or `access_token`."

I have used the current Php client on github
I perform the following steps
1. Get the login URL (1st function)

<i class="Italic">public function loginlive1() {
		$kite = new Kiteconnect("xxxxx");
		$url = $kite->getLoginURL();
		print_r($url);

}</i>

2. Login to kite
3. Get Request token
4. Set access token (2nd function)

<i class="Italic">public function loginlive2() {
		$kite = new Kiteconnect("xxx");
		$user = $kite->generateSession("xxx", "xxx");
		$kite->setAccessToken($user->access_token);
		print_r($kite);

	}</i>

5. Get positions (3rd funtion)

<i class="Italic">public function index() {
		$kite = new Kiteconnect("xxx");
		print_r($kite->getPositions());
}</i>

After performing all the previous steps successfully I get the following error
"Invalid `api_key` or `access_token`."

Please assist