Cannot load this mod; probably due to ItemPrototype replacement in 2.1.20.
"Replaced ItemPrototype::fuel_category with ItemPrototype::fuel_categories." (from 2.1.20 changelog)

Full error message below (translated):

Failed to load mods: Error while loading item prototype "carbon" (item): ItemPrototype::fuel_category was removed. Please use ItemPrototype::fuel_categories.
Modifications: Bob's Metals, Chemicals and Intermediates mod › Angel's Petrochemical Processing

Mods to be disabled:
- bobplates (3.0.1)
- angelspetrochem (2.1.2)

Hell-0, i have a similar problem after newest update:
Failed to load mods: Error while loading item prototype "carbon" (item): ItemPrototype::fuel_category was removed. Please use ItemPrototype::fuel_categories.
Modifications: Space Age › Bob's Metals, Chemicals and Intermediates mod

Mods to be disabled:
-space-age (2.1.20)
-bobplates (3.0.1) x reset mod setting
(resetting does nothing)

Thanks, yes I know about this. The recent Factorio update broke a lot of mods. I'll have a fix out soon.

Fixed