net.minecraftforge.fml.ModLoadingException: Se ha producido un error de Placebo (placebo) durante la fase done
java.lang.NullPointerException: Registry Object not present: apotheosis:obsidian_arrow

https://mclo.gs/cZOe19F

This means your main module config /config/apotheosis/apotheosis.cfg is mismatched between client and server.