How to resolve error "Failed to load MailChimp PHP library. Please refer to the installation requirements."? I'm try to set up Mailchimp module but i keep geeting 
Failed to load MailChimp PHP library. Please refer to the installation requirements.

My steps:


disable mailchimp module
install composer_manager package locally
run: curl -sS https://getcomposer.org/installer | php on my root 
change composer.json(which lay on my root) - see it below 
run: php composer.phar install --no-dev
mailchimp/mailchimp directory is installed in my /vendor folder
clear cache, re=enable module but still getting the error. In my report i see that the module cannot be found.


What i'm doing wrong??

{
    "name": "drupal/composer_manager",
    "type": "drupal-module",
    "description": "Composer Manager is a bridge to best-in-breed, standards compliant PHP libraries that are managed by Composer and Packagist.",
    "homepage": "http://drupal.org/project/composer_manager",
    "license": "GPL-2.0",
    "authors": [
        {
            "name": "Chris Pliakas",
            "email": "opensource@chrispliakas.com",
            "role": "Project Lead"
        },
        {
            "name": "See contributors",
            "homepage": "http://drupal.org/node/1929436/committers",
            "role": "Developer"
        }
    ],
    "support": {
        "issues": "http://drupal.org/project/issues/composer_manager"
    },
    "require": {
        "php": "&gt;=5.3.0",
        "mailchimp/mailchimp": "&gt;=2.0.4"
    }
}


MailChimp module => 7x.3-3

mailchimp library => 2.04
Here are some steps to troubleshoot this error according to this thread: Issue #2054037 Failed to load MailChimp PHP library. Please refer to the installation requirements. (provided by @rtome, above)


Re-read the instructions in MailChimp module's README.txt
Clear the cache
Ensure Libraries module is installed and is working properly
Ensure Mailchimp library is located at sites/all/libraries/mailchimp
Check your versions:



  MailChimp module 7.x-2.x requires MailChimp library 1.3
  MailChimp module > 7.x-3.x requires MailChimp library 2.04



If MailChimp library updated, reinstall MailChimp module