Reached second execution of fulfillment lambda on the same utterance

问题

Using AWS Lex and Lambda, I am trying to build a lambda function which, first validates the invoked intent and, then moves forward with the questions (to assign values to slots).

Towards the end of fulfimentCodeHook, an error occurs, "Reached second execution of fulfillment lambda on the same utterance"

来源：https://stackoverflow.com/questions/44424680/reached-second-execution-of-fulfillment-lambda-on-the-same-utterance