Bat problems?

[b3thanie]

I keep getting messages similar to the one posted below in console and the no one can log onto the server. All messages have 'Bat' / (the numbers here are different every time.)

2012-11-19 10:08:05 [INFO] [STDOUT] Wrong location! og['Bat'/11670, l='world', x
=655.53, y=28.35, z=-411.63]
2012-11-19 10:08:05 [INFO] [STDERR] java.lang.Exception: Stack trace
2012-11-19 10:08:05 [INFO] [STDERR]    at java.lang.Thread.dumpStack(Unknown So
urce)
2012-11-19 10:08:05 [INFO] [STDERR]    at za.a(Chunk.java:862)
2012-11-19 10:08:05 [INFO] [STDERR]    at zn.a(AnvilChunkLoader.java:379)
2012-11-19 10:08:05 [INFO] [STDERR]    at zn.a(AnvilChunkLoader.java:93)
2012-11-19 10:08:05 [INFO] [STDERR]    at zn.a(AnvilChunkLoader.java:73)
2012-11-19 10:08:05 [INFO] [STDERR]    at id.f(ChunkProviderServer.java:154)
2012-11-19 10:08:05 [INFO] [STDERR]    at id.c(ChunkProviderServer.java:102)
2012-11-19 10:08:05 [INFO] [STDERR]    at net.minecraft.server.MinecraftServer.
e(MinecraftServer.java:309)
2012-11-19 10:08:05 [INFO] [STDERR]    at net.minecraft.server.MinecraftServer.
a(MinecraftServer.java:283)
2012-11-19 10:08:05 [INFO] [STDERR]    at hg.c(DedicatedServer.java:153)
2012-11-19 10:08:05 [INFO] [STDERR]    at net.minecraft.server.MinecraftServer.
run(MinecraftServer.java:454)
2012-11-19 10:08:05 [INFO] [STDERR]    at fp.run(SourceFile:818)

 

[Meldiron]

Look here for a simulare issue.
Basicly it seems to be spawning a mob every tick.