There is something with chickens best I can tell, lol:
[18:54:38] [Server thread/WARN]: Wrong location! EntityChicken['Chicken'/470, l='world', x=0.00, y=0.00, z=0.00] (at 0, 0 instead of -64, -11)'
The rest of it I can't decipher:
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: java.lang.Exception: Stack trace
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.Thread.dumpStack(Thread.java:1329)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.world.chunk.Chunk.func_76612_a(Chunk.java:781)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadEntities(AnvilChunkLoader.java:479)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:41)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:12)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraftforge.common.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:344)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraftforge.common.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:302)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:12)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:126)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:199)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at mods.immibis.chunkloader.porting.ChunkLoadInterface132.addChunk(ChunkLoadInterface132.java:106)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at mods.immibis.chunkloader.data.WorldLoaderList.tick(WorldLoaderList.java:319)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at mods.immibis.chunkloader.DimensionalAnchors.onTickInGame(DimensionalAnchors.java:548)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at mods.immibis.core.api.porting.PortableBaseMod$TickEventServerHandler.tickEventServer(PortableBaseMod.java:13)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.common.eventhandler.ASMEventHandler_184_TickEventServerHandler_tickEventServer_ServerTickEvent.invoke(.dynamic)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.common.FMLCommonHandler.onPreServerTick(FMLCommonHandler.java:260)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:536)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
[18:54:38] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)