From what I can tell, errors are caused by
#@TWEAKSCALEBEHAVIOR[fuelTank]
don't know if that's something that meant something in the past, but it's not something I see in other tweakscale cfg's
Maybe it's not needed, but might be easier to actually name the config files for better organization for which part is giving the error at a glance. Alternatively, I noticed other mods grouped up parts in a single config:
@PART[HYPERDRIVE,Charged-GEN2warpengine,Gen2HyperEngine,GEN2CondensedIonEngine]:NEEDS[TweakScale] // Hyper engine, Charge Hyper Engine, Condensed Hyper Engine
{
#@TWEAKSCALEBEHAVIOR[Engine]/MODULE[TweakScale] { }
%MODULE[TweakScale]
{
type = stack
defaultScale = 1.25
}
}