Been getting this lately at the end of server start:

"SleeperMark - Failed to compile: SleeperMark.cs(695,43): error CS1061: Type `HotAirBalloon' does not contain a definition for `fuelStorageInstance' and no extension method `fuelStorageInstance' of type `HotAirBalloon' could be found. Are you missing an assembly reference?"

Updated..

Awesome! Thanks:)