Trouble with Fill's color function with complex expressions in tradingview

Question

I'm trying to make it so if cskies = false then none of the plots or fills will appear. I've got the plotlines to appear with the complex expressions, but the fills aren't being responsive.

I don't get an error in the pine editor when I click "add to chart" but I do get a study error on the indicator once it's loaded in the chart. So I am unsure what to fix. Pine reference says that fill can handle complex expressions for its color. I'm confused as to what I am doing wrong.

The first fill is the complex expression I am trying to use, while the second fill is an example of what will load without error.

I've also tried instead of putting the color.rgb in the complex expression and just using something basic like color.red, but I get the same study error. This is on Version 5.

cskies = input(true, "Crimson Skies On/Off")
AlienWeaponry = input(close, "Source")
Protokult = input(75, "Heavy Resistance")
FleshgodApocalypse = input(75, "Heavy Support")
OmniumGatherum = input(8, "Red Power")
Soilwork = input(8, "Green Power")

BillyTalent = ta.highest(AlienWeaponry, Protokult)
Incubus = ta.lowest(AlienWeaponry, FleshgodApocalypse)
ChildrenOfBodom = ta.highest(AlienWeaponry, OmniumGatherum)
Rammstein = ta.lowest(AlienWeaponry, Soilwork)

Trivium = plot(ChildrenOfBodom, color=cskies ? #640000 : na)
GreenDay = plot(BillyTalent, color= cskies ? color.red : na)
LinkinPark = plot(Rammstein, color=cskies ? #006400 : na)
FooFighters= plot(Incubus, color=cskies ? color.lime : na)

fill(Trivium, GreenDay, color=cskies ? color.rgb(100,0,0,85) : na)
fill(LinkinPark, FooFighters, color=color.rgb(0,100,0,85))