Failed to load mods: Error in assignID: fuel-category with name 'nuke' does not exist.
Source: mini-locomotive (locomotive).
It loads correctly when pyalienlife and pyalternativeenergy are enabled, but crashes without them.
Minimal repro steps:
0. Disable all mods
1. Enable pymodpack
2. Disable pyalienlife, pyalternativeenergy, and pymodpack
3. Enable mini_trains and PyEarlyMiniTrainsContinued
4. Restart and "Error loading mods" during startup
