Fuel for K2 and AAI cannot be used

I know it's been over a year, but I got the same problem and I found a way to fix it, and I will share for anyone who is interested, even if that chance is (very) low
1) Open the prototypes\superheater.lua file of this mod
2) Delete the line: "superheater.energy_source.effectivity = 2"
3) now replace it with the following:

superheater.energy_source = {
type = "burner",
fuel_categories = {"chemical", "vehicle-fuel"},
fuel_inventory_size = 1,
effectivity = 2
}

This will allow the superheater to take the "vehicle-fuel" type that Krastorio adds in addition to all the other standard fuels.
I might want to learn how to make mods and make a compatibility patch...

DUDE!!!
Many thanks! This also enables the processed fuel from AAI Industry

I know it's been over a year, but I got the same problem and I found a way to fix it, and I will share for anyone who is interested, even if that chance is (very) low
1) Open the prototypes\superheater.lua file of this mod
2) Delete the line: "superheater.energy_source.effectivity = 2"
3) now replace it with the following:

superheater.energy_source = {
type = "burner",
fuel_categories = {"chemical", "vehicle-fuel"},
fuel_inventory_size = 1,
effectivity = 2
}

This will allow the superheater to take the "vehicle-fuel" type that Krastorio adds in addition to all the other standard fuels.
I might want to learn how to make mods and make a compatibility patch...

Error on loading !

Error in assignID: fuel-category with name 'vehicle-fuel' does not exist.
Source: superheater (boiler)

I want to enjoy this mod.
Please help me, UNOwen !