Error message

Warning: md5_file(public://egw_images/10.1.jpg): failed to open stream: "DrupalPublicStreamWrapper::stream_open" call failed in openseadragon_field_formatter_view() (line 71 of /var/www/library.egwwritings.org/httpdocs/sites/all/modules/contrib/openseadragon/includes/field.inc).