[SOLVED]Custom element code to animate bow and shield crashes server startup but works fine in singleplayer

The problem here is that you are trying to add client properties through the server. Item properties like blocking for shields should be registered during client setup.

Also, you are for some reason creating an instance of the class which loads the properties, which is not needed.

No, what I'm telling you is that you only need to subscribe to the client setup event to load the properties, you don't need to do anything else.

@Mod.EventBusSubscriber(bus = Mod.EventBusSubscriber.Bus.MOD)
public class CustomSetupManager {



		@SubscribeEvent
		public static void clientLoad(final FMLClientSetupEvent event) {
			SartoriumBowItemProperties.addCustomItemProperties();
			GoldShieldItemProperties.addCustomItemProperties();
		}

}

@KentukySS 
Can you explain to me how you animated the shield?