error log

i have got on the error log a warning:

[31-May-2018 19:28:21 UTC] PHP Warning: S3::listBuckets(): [7] Failed to connect to s3.amazonaws.com port 443: Connection timed out in /home/wp-content/plugins/woo-product-download-from-amazon-s3/includes/S3.php on line 373

[31-May-2018 19:28:21 UTC] PHP Warning: in_array() expects parameter 2 to be array, boolean given in /home//wp-content/plugins/woo-product-download-from-amazon-s3/woo-product-download-from-amazon-s3.php on line 510