2002 Starcraft Camper water heater problem

When I tried to light the pilot of my water heater nothing happened. I turned on the pilot held the button down and still nothing. I repeated this about 10 times and at one time I did hear the gas come on and the burner ignited and was on for about 15 second and then went out. Pilot never came on. Anyone ever had this problem? If so what would the problem be? :wall: