2013-06-21 14:59:11 [INFO] [STDERR] "Silently" catching entity tracking error.
2013-06-21 14:59:11 [INFO] [STDERR] net.minecraft.util.ReportedException: Adding entity to track
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.entity.EntityTracker.addEntityToTracker(EntityTracker.java:225)
2013-06-21 14:59:11 [INFO] [STDERR]  at cpw.mods.fml.common.registry.EntityRegistry.tryTrackingEntity(EntityRegistry.java:363)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.entity.EntityTracker.addEntityToTracker(EntityTracker.java:66)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.world.WorldManager.onEntityCreate(WorldManager.java:37)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.world.World.obtainEntitySkin(World.java:1588)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.world.WorldServer.obtainEntitySkin(WorldServer.java:935)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.world.World.spawnEntityInWorld(World.java:1576)
2013-06-21 14:59:11 [INFO] [STDERR]  at com.portmods.mechcraft.ItemKeyboardMouse.onItemRightClick(ItemKeyboardMouse.java:106)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.item.ItemStack.useItemRightClick(ItemStack.java:173)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.item.ItemInWorldManager.tryUseItem(ItemInWorldManager.java:349)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.network.NetServerHandler.handlePlace(NetServerHandler.java:539)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.network.packet.Packet15Place.processPacket(Packet15Place.java:79)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.network.MemoryConnection.processReadPackets(MemoryConnection.java:89)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.network.NetServerHandler.networkTick(NetServerHandler.java:134)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.network.NetworkListenThread.networkTick(NetworkListenThread.java:53)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.server.integrated.IntegratedServerListenThread.networkTick(IntegratedServerListenThread.java:109)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:675)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:571)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:127)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:469)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)
2013-06-21 14:59:11 [INFO] [STDERR] Caused by: java.lang.NullPointerException
2013-06-21 14:59:11 [INFO] [STDERR]  at cpw.mods.fml.common.network.EntitySpawnPacket.generatePacket(EntitySpawnPacket.java:75)
2013-06-21 14:59:11 [INFO] [STDERR]  at cpw.mods.fml.common.network.FMLPacket.makePacket(FMLPacket.java:131)
2013-06-21 14:59:11 [INFO] [STDERR]  at cpw.mods.fml.common.network.FMLNetworkHandler.getEntitySpawningPacket(FMLNetworkHandler.java:371)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.entity.EntityTrackerEntry.getPacketForThisEntity(EntityTrackerEntry.java:469)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.entity.EntityTrackerEntry.tryStartWachingThis(EntityTrackerEntry.java:375)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.entity.EntityTrackerEntry.sendEventsToPlayers(EntityTrackerEntry.java:458)
2013-06-21 14:59:11 [INFO] [STDERR]  at net.minecraft.entity.EntityTracker.addEntityToTracker(EntityTracker.java:211)
2013-06-21 14:59:11 [INFO] [STDERR]  ... 20 more