QPX Express query error

My request was being processed correctly the i tried to get custom result like:

http://ift.tt/1Q04xPD‌​ps(tripOption(saleTotal,slice(segment(leg(arrivalTime,departureTime,origin,destin‌​ation,originTerminal,duration,operatingDisclosure)))))

but its producing error

{ "error": { "errors": [ { "domain": "global", "reason": "invalidParameter", "message": "Invalid field selection tri\u200c\u200bps(tripOption(saleTotal,slice(segment(leg(arrivalTime,departureTime,origin,destin\u200c\u200bation,originTerminal,duration,operatingDisclosure)))))", "locationType": "parameter", "location": "fields" } ], "code": 400, "message": "Invalid field selection tri\u200c\u200bps(tripOption(saleTotal,slice(segment(leg(arrivalTime,departureTime,origin,destin\u200c\u200bation,originTerminal,duration,operatingDisclosure)))))" } } array(1) { [0]=> string(1) "1" }