It sounds like you have air in the gas line. The clicking you hear sounds like it is trying to ignite. You said you lit the stove, and if you did and let it run for 30 seconds or so, try turning up the temp and starting the heater again. It should light.
Dave and Kim
Charlie and Ripken (4 Leggers)
2012 GMC Sierra Denali 2500 6.6L Diesel
2013 Columbus 320RS
Times camping in 2013 - 5