Got this after adding muluna moon mod

3.564 Error ModManager.cpp:1758: Failed to load mod "RateCalculatorClassic": RateCalculatorClassic/data-final-fixes.lua:43: attempt to compare number with nil
stack traceback:
RateCalculatorClassic/data-final-fixes.lua:43: in main chunk
3.613 Loading mod core 0.0.0 (data.lua)
3.697 Checksum for core: 1117214423
3.719 Error ModManager.cpp:1758: Error in assignID: recipe-category with name 'recycling' does not exist.

Without reproducing the issue, I've made a tentative fix in 3.0.1. Might crash at other places though, so make a save before trying.