I commented line 211 in the "ddi-belts.lua"
I think the problem apears when you don't have Space Age.
- Open the Folder: %AppData%\Factorio\mods
- Open: more-belts_0.2.8.zip (or extract, but I edited the file directly in WinRar)
- Open: \prototypes\recipe\ddi-belts.lua
- Comment or delete line 211.
Line 211: additional_categories = {"metallurgy-or-assembling",},
Replace with: -- additional_categories = {"metallurgy-or-assembling",},