尝试使用PHP SDK连接到AWS S3时出现“InvalidArgumentException”。 错误：找不到'endpoints_prefix_history.json'的文件

I get the following error when trying to access my S3 bucket using the AWS PHP SDK:

Uncaught exception 'InvalidArgumentException' with message 'File not found: /Applications/MAMP/htdocs/vendor/aws/aws-sdk-php/src/Endpoint/../data/endpoints_prefix_history.json'.

The file endpoints_prefix_history.json does not exist. I installed the SDK using composer, and I'm trying the basic usage examples - https://docs.aws.amazon.com/sdk-for-php/v3/developer-guide/getting-started_basic-usage.html.

I'm currently using the following code to connect to my AWS account:

    use Aws\S3\S3Client;
    use Aws\Exception\AwsException;

    try{

        $s3_client = new Aws\S3\S3Client([
            'region' => 'eu-west-1',
            'version' => '2006-03-01',
            'credentials' => [
                'key'    => '<KEY>',
                'secret' => '<SECRET>'
            ]
        ]);


        //Listing all S3 Bucket
        $buckets = $s3_client->listBuckets();
        foreach ($buckets['Buckets'] as $bucket) {
            echo $bucket['Name'] . "
";
        }

    }catch( S3Exception $e ){

        echo $e->getMessage();

    }catch(AwsException $e){

        echo $e->getAwsRequestId() . "
";
        echo $e->getAwsErrorType() . "
";
        echo $e->getAwsErrorCode() . "
";

    }

constant('Env::ABS_PATH').'vendor/autoload.php'; is being loaded in a config.php when the app loads.

I'm new to the AWS PHP SDK, so I'm not really sure what is wrong here. Any information in the right direction is highly appreciated.