getstream.io SSL certificate unable to get local issuer certificate

I need some help. I'm integrating getstream.io into my laravel application (v5.1), I'm stuck with this error:

cURL error 60: SSL certificate problem: unable to get local issuer certificate

This is my code:

use GetStream\Stream\Client;

public function index()
{

 $client = new Client('rrzp7mz8htgn', '8cgs94jg2z5da2h4q2an8q6q5vktrp8y8w7rsft3zndf63c8y9n59g2h2qvtdhqq');

 $ericFeed = $client->feed('user', 'eric');

  $data = [
    "actor"=>"eric",
    "verb"=>"like",
    "object"=>"3",
    "tweet"=>"Hello world"
  ];
  $ericFeed->addActivity($data);

}

I followed the instructions below from packalyst

1. Add the get-stream into your composer:

   "require": { "get-stream/stream-laravel": "~2.1" },

2. then run composer update

3. I also added the provider and the aliases

   'providers' => array( 'GetStream\StreamLaravel\StreamLaravelServiceProvider', ... ),

   'aliases' => array( 'FeedManager' => 'GetStream\StreamLaravel\Facades\FeedManager', ... ),

4. I run:

   php artisan vendor:publish --provider="GetStream\StreamLaravel\StreamLaravelServiceProvider"

5. I emailed already getstream.io, but no response yet. I'll be updated this post when I received some answers from them.

I also checked this post from laracast, but there's no answer. http://ift.tt/1TaqB7j

via Chebli Mohamed