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My friends and I have been playing on my modded server for a couple of days now. It's been running perfectly fine ever since we started.

Now, the console is spamming this error:

01.08 20:17:01 [Server] Server thread/ERROR "Silently" catching entity tracking error.
01.08 20:17:01 [Server] INFO net.minecraft.util.ReportedException: Adding entity to track
01.08 20:17:01 [Server] INFO at net.minecraft.entity.EntityTracker.func_72785_a(EntityTracker.java:230) [mn.class:?]
01.08 20:17:01 [Server] INFO at cpw.mods.fml.common.registry.EntityRegistry.tryTrackingEntity(EntityRegistry.java:364) [EntityRegistry.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.entity.EntityTracker.func_72786_a(EntityTracker.java:61) [mn.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.world.WorldManager.func_72703_a(SourceFile:31) [mp.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.world.World.func_72923_a(World.java:1347) [ahb.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.world.WorldServer.func_72923_a(WorldServer.java:844) [mt.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.world.World.func_72868_a(World.java:3304) [ahb.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.world.chunk.Chunk.func_76631_c(Chunk.java:921) [apx.class:?]
01.08 20:17:01 [Server] INFO at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:46) [ChunkIOProvider.class:?]
01.08 20:17:01 [Server] INFO at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:12) [ChunkIOProvider.class:?]
01.08 20:17:01 [Server] INFO at net.minecraftforge.common.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:344) [AsynchronousExecutor.class:?]
01.08 20:17:01 [Server] INFO at net.minecraftforge.common.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:302) [AsynchronousExecutor.class:?]
01.08 20:17:01 [Server] INFO at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:12) [ChunkIOExecutor.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:126) [ms.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101) [ms.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:199) [ms.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.world.World.func_72964_e(World.java:419) [ahb.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.world.World.func_147439_a(World.java:345) [ahb.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.block.BlockFire.tryCatchFire(BlockFire.java:214) [alb.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.block.BlockFire.func_149674_a(BlockFire.java:152) [alb.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.world.WorldServer.func_72955_a(WorldServer.java:550) [mt.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:181) [mt.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:625) [MinecraftServer.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334) [lt.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) [MinecraftServer.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) [MinecraftServer.class:?]
01.08 20:17:01 [Server] INFO at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]
01.08 20:17:01 [Server] INFO Caused by: java.lang.IllegalStateException: Entity is already tracked!
01.08 20:17:01 [Server] INFO at net.minecraft.entity.EntityTracker.func_72785_a(EntityTracker.java:196) ~[mn.class:?]
01.08 20:17:01 [Server] INFO ... 26 more

The server runs fine, but this error is spammed a lot. Any idea what is causing this problem?

Mods (both clients and server have the same mods)

Is there a crash report? And can you post the entire crash report please? Also if it doesnt crash or cause lag I personally wouldn't worry about it. If you are concerned maybe get a lag plugin to clean up entities.

The server works fine, I just don't know what is causing that problem. There is no lag at all either.