I'm currenly working on adding a custom mob to the game. It will spawn using an egg but it willl despawn within like 4 seconds. I also get this error in my console when I try spawning in the mob.

 

2013-06-14 16:13:16 [iNFO] [sTDERR] net.minecraft.util.ReportedException: Adding entity to track
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.entity.EntityTracker.addEntityToTracker(EntityTracker.java:225)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at cpw.mods.fml.common.registry.EntityRegistry.tryTrackingEntity(EntityRegistry.java:363)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.entity.EntityTracker.addEntityToTracker(EntityTracker.java:66)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.world.WorldManager.onEntityCreate(WorldManager.java:37)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.world.World.obtainEntitySkin(World.java:1585)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.world.WorldServer.obtainEntitySkin(WorldServer.java:935)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.world.World.spawnEntityInWorld(World.java:1573)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.item.ItemMonsterPlacer.spawnCreature(ItemMonsterPlacer.java:120)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.item.ItemMonsterPlacer.onItemUse(ItemMonsterPlacer.java:76)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.item.ItemStack.tryPlaceItemIntoWorld(ItemStack.java:149)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.item.ItemInWorldManager.activateBlockOrUseItem(ItemInWorldManager.java:425)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.network.NetServerHandler.handlePlace(NetServerHandler.java:553)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.network.packet.Packet15Place.processPacket(Packet15Place.java:79)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.network.MemoryConnection.processReadPackets(MemoryConnection.java:89)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.network.NetServerHandler.networkTick(NetServerHandler.java:134)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.network.NetworkListenThread.networkTick(NetworkListenThread.java:53)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.server.integrated.IntegratedServerListenThread.networkTick(IntegratedServerListenThread.java:109)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:675)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:571)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:127)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:469)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)
2013-06-14 16:13:16 [iNFO] [sTDERR] Caused by: java.lang.IllegalStateException: Entity is already tracked!
2013-06-14 16:13:16 [iNFO] [sTDERR] 	at net.minecraft.entity.EntityTracker.addEntityToTracker(EntityTracker.java:205)
2013-06-14 16:13:16 [iNFO] [sTDERR] 	... 21 more

 

 

As you can see none of the error says anything about my class.

 

 

 

 

Here is where I load the wizard and all the good stuff about it.

 

    EntityRegistry.registerModEntity(EntityWizard.class, "Wizard", 2, this, 80, 3, true);
    EntityRegistry.addSpawn(EntityWizard.class, 5, 2, 6, EnumCreatureType.creature, BiomeGenBase.plains, BiomeGenBase.beach, BiomeGenBase.jungle);
    LanguageRegistry.instance().addStringLocalization("entity.Wizard.name", "Wizard");

 

I'm going to  try changing the tracker range to 100 and the updateFrequency to 10. Please give me some help.

Changing the track range did not seem to work.

can we see al of your entity registrations? (all those lines where you register all of your entities)