API help for tracking flight

Hi, Im also newbie in flightaware and trying to use the ArrayOfFlightInfoStatusStruct object.
until a few days ago I have got exception saying {“The data contract type ‘FlightawareServiceReference.ArrayOfFlightInfoStatusStruct’ cannot be deserialized because the required data members ‘PropertyChanged, flightsField, next_offsetField’ were not found.”}"

but now I get none response at all.
can you share your full code, please ?
mine is here API for flight info - #7 by shaulzak
Thanks