java.lang.NoSuchMethodException: nl.Dobbermann2.LetsMod.EntityDiamond.<init>(net.minecraft.world.World)
[17:42:30] [Server thread/WARN]: Skipping Entity with id 3
	at java.lang.Class.getConstructor0(Class.java:2715)
	at java.lang.Class.getConstructor(Class.java:1659)
	at net.minecraft.entity.EntityList.createEntityByID(EntityList.java:221)
	at net.minecraft.item.ItemMonsterPlacer.spawnCreature(ItemMonsterPlacer.java:173)
	at net.minecraft.item.ItemMonsterPlacer.onItemUse(ItemMonsterPlacer.java:79)
	at net.minecraft.item.ItemStack.tryPlaceItemIntoWorld(ItemStack.java:144)
	at net.minecraft.server.management.ItemInWorldManager.activateBlockOrUseItem(ItemInWorldManager.java:418)
	at net.minecraft.network.NetHandlerPlayServer.processPlayerBlockPlacement(NetHandlerPlayServer.java:588)
	at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.processPacket(C08PacketPlayerBlockPlacement.java:74)
	at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.processPacket(C08PacketPlayerBlockPlacement.java:122)
	at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:232)
	at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:182)
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:720)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:608)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:118)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482)
	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:746)