Error message

• User warning: Error executing "DeleteObject" on "https://bo-john-bull.s3.ap-southeast-1.amazonaws.com/files/styles/gallery-small/s3/sale-images/347-public/1106133.jpg"; AWS HTTP error: cURL error 6: Could not resolve host: bo-john-bull.s3.ap-southeast-1.amazonaws.com (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://bo-john-bull.s3.ap-southeast-1.amazonaws.com/files/styles/gallery-small/s3/sale-images/347-public/1106133.jpg in Aws\S3\StreamWrapper->triggerError() (line 764 of sites/all/vendor/aws/aws-sdk-php/src/S3/StreamWrapper.php).
• Warning: session_set_cookie_params(): Cannot change session cookie parameters when session is active in drupal_session_start() (line 300 of includes/session.inc).
• Notice: session_start(): A session had already been started - ignoring in drupal_session_start() (line 304 of includes/session.inc).