d0bafd2 this commit add a new FFUtils.getColorFromFluid method which call net.minecraft.client.Minecraft，and in MainRegistry:

This will crash the server because net.minecraft.client.Minecraft doesn't exist in server, since the new fluidColors map is only for client render, may be we could move registerFluidColors to another place or add a check like

if (event.getSide().isClient()) {
    ModForgeFluids.registerFluidColors();
}

Already fixed yesterday in dev. Fix will come out today.

Can confirm this fixes issue #115 I reported earlier.