Experiencing this error when loading the mod. Others seem to have reported this, but I wanted to include context around it directly from my log file.

5.133 Loading mod Krastorio2-spaced-out 1.4.32 (data-updates.lua)
5.139 Error ModManager.cpp:1765: Failed to load mod "Krastorio2-spaced-out": ...orio2-spaced-out__/prototypes/updates/base/resources.lua:24: attempt to index field 'map_gen_settings' (a nil value)
stack traceback:
...orio2-spaced-out__/prototypes/updates/base/resources.lua:24: in main chunk
[C]: in function 'require'
Krastorio2-spaced-out/data-updates.lua:12: in main chunk
5.173 Loading mod core 0.0.0 (data.lua)
5.263 Checksum for core: 3810281447
5.280 Error ModManager.cpp:1765: Error in assignID: recipe-category with name 'recycling' does not exist.

This error seems to be caused by the mod Nuclear Engineering.
https://mods.factorio.com/mod/nucular-engineering

I am not sure what about it caused the error, but the mods do not seem to be compatible.
Just a PSA for anyone who also experienced this error.

Additionally, SolarSystem++ is incompatible and generates a map_gen.lua error.
https://mods.factorio.com/mod/solarsystemplusplus