2017-08-31 14:37:01: imagepng(http://www.conferenceseries.com/fdms/backend/web/upload/qrcode/2a/45/2a45abd93a7db10396149806660da24191d365ae.png): failed to open stream: HTTP wrapper does not support writeable connections2017-08-31 14:51:12: imagepng(http://www.conferenceseries.com/fdms/backend/web/upload/qrcode/2a/45/2a45abd93a7db10396149806660da24191d365ae.png): failed to open stream: HTTP wrapper does not support writeable connections