FlightXML2/Set Alert - Backend processing error

FlightAware AeroAPI
1

Please advise the cause and solution for below error.

REQUEST:
http://flightxml.flightaware.com/json/FlightXML2/SetAlert {“ident”:“SWA1080-1568090759-airline-0543”,“origin”:“KSAN”,“destination”:“KPHX”,“channels”:“{16 e_filed e_departure e_arrival e_diverted e_cancelled}”,“max_weekly”:10000}
RESPONSE:
{“error”:“Backend processing error (2019-09-12T19:30:01)”}

2

The FlightXML restful endpoints only accept arguments in the form of parameters. In this case the request should be in the form of:
http://flightxml.flightaware.com/json/FlightXML2/SetAlert?ident=SWA1080-1568090759-airline-0543&origin=KSAN&destination=KPHX&channels={16 e_filed e_departure e_arrival e_diverted e_cancelled}&max_weekly=1000