getting permission denied in amazon aws

I am trying to connect to amazon s3 by Using the AWS credentials file for that i have done following things

1. I have created credentials.ini file at .aws\credentials. It have valid AWSAccessKeyId and AWSSecretKey

   [default]
   AWSAccessKeyId=somekey
   AWSSecretKey=somesecretkey
   
   

2. I am doing following to use key and list all object

.

$s3 = new Aws\S3\S3Client([
    'version' => 'latest',
    'region'  => 'us-west-2'
]);


$result = $s3->listBuckets();
var_dump($result);

and i am getting error

Warning: parse_ini_file(C:\Users\user\.aws\credentials): failed to open stream: Permission denied in C:\xampp\htdocs\aws\vendor\aws\aws-sdk-php\src\Credentials\CredentialProvider.php on line 216

Fatal error: Uncaught exception 'Aws\Exception\CredentialsException' with message 'Error retrieving credentials from the instance profile metadata server. (cURL error 28: Connection timed out after 1000 milliseconds (see http://ift.tt/1mgwZgQ))' in C:\xampp\htdocs\aws\vendor\aws\aws-sdk-php\src\Credentials\InstanceProfileProvider.php:79 Stack trace: #0 C:\xampp\htdocs\aws\vendor\guzzlehttp\promises\src\Promise.php(199): Aws\Credentials\InstanceProfileProvider->Aws\Credentials\{closure}(Array) #1 C:\xampp\htdocs\aws\vendor\guzzlehttp\promises\src\Promise.php(152): GuzzleHttp\Promise\Promise::callHandler(2, Array, Array) #2 C:\xampp\htdocs\aws\vendor\guzzlehttp\promises\src\TaskQueue.php(60): GuzzleHttp\Promise\Promise::GuzzleHttp\Promise\{closure}() #3 C:\xampp\htdocs\aws\vendor\guzzlehttp\guzzle\src\Handler\CurlMultiHandler.php(96): GuzzleHttp\Promise\TaskQueue->run() #4 C:\xampp\htdocs\aws\vendor\guzzlehttp\guzzle\src\Handler\CurlMultiHandler.php(123): GuzzleHttp\Handler\CurlMultiHandler->tick in C:\xampp\htdocs\aws\vendor\aws\aws-sdk-php\src\Credentials\InstanceProfileProvider.php on line 79