chunk error

this seems to spam the console and server lags-
12:25:46 [INFO] Chunk (8, 5) stored at (16, 0)
12:25:46 [INFO] net.minecraft.server.Chunk
12:25:46 [SEVERE] java.lang.Throwable
12:25:46 [SEVERE] at net.minecraft.server.ChunkProviderServer.getOrCreateC
hunk(ChunkProviderServer.java:124)
12:25:46 [SEVERE] at net.minecraft.server.World.getChunkAt(World.java:280)

12:25:46 [SEVERE] at net.minecraft.server.World.j(World.java:1883)
12:25:46 [SEVERE] at net.minecraft.server.World.doTick(World.java:1737)
12:25:46 [SEVERE] at net.minecraft.server.MinecraftServer.h(MinecraftServe
r.java:444)
12:25:46 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:363)
12:25:46 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(Sour
ceFile:422)
if you could help thanks

 

Use Chunkster.