AWS SES Guzzle Error when sending email

I have set up AWS Ses service using PHP SDK:

$this->client = SesClient::factory([
    'key' => $params['key'],
    'secretKey' => $params['secret_key'],
    'region' => 'eu-west-1',
    'base_url' => 'http://ift.tt/1Czzwtj',
]);

$this->client->sendEmail($this->params());

public function params() {
    array(
        'Source' => 'verified@gmail.com',
        'Destination' => array(
            'ToAddresses' => array('receiver@yahoo.com')
        ),
        'Message' => array(
            'Subject' => array(
                'Data' => 'SES Testing',
                'Charset' => 'UTF-8',
            ),
            // Body is required
            'Body' => array(
                'Text' => array(
                    'Data' => 'My plain text email',
                    'Charset' => 'UTF-8',
                ),
                'Html' => array(
                    'Data' => '<b>My HTML Email</b>',
                    'Charset' => 'UTF-8',
                ),
            ),
        ),
        'ReplyToAddresses' => array( 'replyTo@email.com' ),
        'ReturnPath' => 'bounce@email.com'
    );
}

After trying to send email, I receive this error message:

exception 'Guzzle\Http\Exception\CurlException' with message 
'[curl] 23: Failed writing body (0 != 86) [url] http://ift.tt/1Czzwtj' 
in C:\xampp\htdocs\myProject\protected\lib\vendor\guzzle\guzzle\src\Guzzle\Http\Curl\CurlMulti.php:338

Anyone know how to fix that error?