How to read from a JSON File and convert to HL7 message

Hi Community,

I am trying to read a JSON file and convert into HL7 message.Please find the example below

Set Jsonobj={"Doctype":"ADT^A01","PatientId":"123","PatientName":"Alex"}

Set Dynjsonobj= ##class(%Library.DynamicObject).%FromJSON(Jsonobj)

Error :<THROW>%FromJSON+37^%Library.DynamicAbstractObject.1 *%Exception.General READ error while reading input stream 10 Line 1 Offset 0

I am getting this error while reading the file,Can you please tell me where i am doing wrong in converting the file?

Joe