I am trying to implement my version of the flashcard template and I can't launch the skill by asking for help. The code tests fine in the Lambda console but comes back with the "Remote endpoint can't be called" error in the service simulator and "The target Lambda application returned a failure response" in the card on my Echo. The Help function works fine once the skill has been launched any other way. I am using the handleGetHelpRequest from the ChemistryFlashCards sample on GitHub. What am I missing here?