Trading post challenge - first level

I still don't understand how to start this. I built 2 granaries, made one of the guy fished, collected more than 40 food ... don't know why at the end of the 3 minutes, it says I failed ... PLEASE HELPPPPPPPPPPPPPP

Did you go back to the guy who gave you the challenge to tell him you had finished before the time ran out? Click on the exclamation mark to talk to him.