Why there is "Failure" after the "Answer bot" card

Why there is "Failure" after the "Answer bot" card

Hi, I'm building a Chat bot for my company.
I implement the card "Answer bot" and after this card there is the word "Failure", then if I add another card, this card doesn't work. In this case I add the "End" card.
Can you explain how to do to avoid this "Failure" ?


Thanks for your help.