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amazon web services - AWS SDK for PHP: Error retrieving credentials from the instance profile metadata server

I am trying to send SNS messeges to android through web api. Downloaded and installed the SDK from http://aws.amazon.com/developers/getting-started/php/

Got following error while running sample.php:

Fatal error: Uncaught exception 'AwsCommonExceptionInstanceProfileCredentialsException' with message 'Error retrieving credentials from the instance profile metadata server. When you are not running inside of Amazon EC2, you must provide your AWS access key ID and secret access key in the "key" and "secret" options when creating a client or provide an instantiated AwsCommonCredentialsCredentialsInterface object. ([curl] 28: Connection timed out after 5016 milliseconds [url] http://169.254.169.254/latest/meta-data/iam/security-credentials/)' in C:xampphtdocsaws-phpvendorawsaws-sdk-phpsrcAwsCommonInstanceMetadataInstanceMetadataClient.php:85 Stack trace: #0 C:xampphtdocsaws-phpvendorawsaws-sdk-phpsrcAwsCommonCredentialsRefreshableInstanceProfileCredentials.php(52): AwsCommonInstanceMetadataInstanceMetadataClient->getInstanceProfileCredentials() #1 C:xampphtdocsaws-phpvendorawsaws-sdk-phpsrcAwsCommonCredentialsAbstractRefreshableCredentials.php(54): AwsCommonCredentialsRefreshable in C:xampphtdocsaws-phpvendorawsaws-sdk-phpsrcAwsCommonInstanceMetadataInstanceMetadataClient.php on line 85

A little guidance on this topic will help me a lot

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