Upload file not working

Got his when tried to upload file…using latest v9.2.24

TypeError: Cannot read property 'start' of undefined
    at Object.read_file (desk.min.js?ver=1513952653.0:9008)
    at Object.upload_file (desk.min.js?ver=1513952653.0:8946)
    at upload_next (desk.min.js?ver=1513952653.0:8923)
    at Object.upload_multiple_files (desk.min.js?ver=1513952653.0:8910)
    at HTMLButtonElement.<anonymous> (desk.min.js?ver=1513952653.0:8888)
    at HTMLButtonElement.dispatch (jquery.min.js:3)
    at HTMLButtonElement.$event.dispatch (report.min.js?ver=1513952653.0:3020)
    at HTMLButtonElement.r.handle (jquery.min.js:3)
desk.min.js?ver=1513952653.0:1584 Unable to handle failed response
desk.min.js?ver=1513952653.0:1585 TypeError: Cannot read property 'responseText' of undefined
    at _ (desk.min.js?ver=1513952653.0:1452)
    at Object.<anonymous> (desk.min.js?ver=1513952653.0:1579)
    at i (jquery.min.js:2)
    at Object.fireWith [as rejectWith] (jquery.min.js:2)
    at z (jquery.min.js:4)
    at XMLHttpRequest.<anonymous> (jquery.min.js:4)
(anonymous) @ desk.min.js?ver=1513952653.0:1585
i @ jquery.min.js:2
fireWith @ jquery.min.js:2
z @ jquery.min.js:4
(anonymous) @ jquery.min.js:4
XMLHttpRequest.send (async)
send @ jquery.min.js:4
ajax @ jquery.min.js:4
frappe.request.call @ desk.min.js?ver=1513952653.0:1539
frappe.call @ desk1.min.js?ver=1513952653.0:436
refresh_notifications @ desk.min.js?ver=1513952653.0:12277
(anonymous) @ desk.min.js?ver=1513952653.0:12264

Solved…my site config…disable_async is set to false…i