Hi there
Seems they removed some graphics you rely on: https://github.com/danielmartin0/Cerys-Moon-of-Fulgora/commit/f9f2a6e1103cff036544b5b8e5d2754664550a8d#diff-f3643007447901acad38d7e7526b9b1a5ceb3e1e0283ed8be85fc40ad4f77aa6

Don't know how you would fix that, maybe the pngs are available somewhere else...?

This crashes Factorio when loading:

42.564 Error AtlasBuilder.cpp:1266: File Cerys-Moon-of-Fulgora/graphics/entity/centrifuge/centrifuge-pipe-W.png not found; mods: BottleneckLite castra PlanetsLib atan-nuclear-science cerys-and-nuclear-science enemyracemanager janus kittycat maraxsis omnia runtime-spoilage-library
Prototypes using the sprite:
data.raw["assembling-machine"]["atan-atom-forge"]

edit: see maybe this https://mods.factorio.com/mod/Cerys-Moon-of-Fulgora/discussion/68a3a8d053f8d9462ea8cfe1

These improved centrifuge graphics were moved to PlanetsLib in 4.0 by request of other authors, allowing more mods to make use of them.

In v4.0.2, I put the files back in the Cerys mod. It would be nice if the DJKolekson could switch to the PlanetsLib files in future.