I am getting a lot of console spam for my client in the Uncle Genny's modpack, which includes version 8.0.4 of Fossils and Archeology Revival.

One excerpt from the console:

net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.sendToAll(SimpleNetworkWrapper.java:236)
	at fossilsarcheology.server.entity.prehistoric.EntityPrehistoric.doPlayBonus(EntityPrehistoric.java:379)
	at fossilsarcheology.server.block.entity.TileEntityBubbleBlower.func_73660_a(TileEntityBubbleBlower.java:19)
	at net.minecraft.world.World.func_72939_s(World.java:1838)
	at

Looking into this, it appears that the relevant function does not include the check for world.isRemote, causing the client to try sending packets that should only be sent by the server.

Let me know if there's any way I can help, be it further testing, full logs, etc.