Dynmap herps and derps. Help please <3

So I am not sure why, but I am getting this error. Spamming my server.
(Currently I am rendering a map) Is that the reason?

Code:

13:48:22 [INFO] Attempted to place a tile entity (net.minecraft.server.TileEntitySign@109fc4bf) at 1315,3,-1656 (DIRT) where there was no entity tile!
13:48:22 [INFO] Chunk coordinates: 1312,-1664
13:48:22 [SEVERE] java.lang.Exception
13:48:22 [SEVERE] at net.minecraft.server.Chunk.a(Chunk.java:631)
13:48:22 [SEVERE] at net.minecraft.server.Chunk.a(Chunk.java:610)
13:48:22 [SEVERE] at net.minecraft.server.ChunkRegionLoader.a(ChunkRegionLoader.java:300)
13:48:22 [SEVERE] at net.minecraft.server.ChunkRegionLoader.a(ChunkRegionLoader.java:66)
13:48:22 [SEVERE] at net.minecraft.server.ChunkRegionLoader.a(ChunkRegionLoader.java:55)
13:48:22 [SEVERE] at net.minecraft.server.ChunkProviderServer.loadChunk(ChunkProviderServer.java:146)
13:48:22 [SEVERE] at com.bergerkiller.bukkit.nolagg.examine.TimedChunkProviderServer.loadChunk(TimedChunkProviderServer.java:96)
13:48:22 [SEVERE] at org.bukkit.craftbukkit.CraftWorld.loadChunk(CraftWorld.java:234)
13:48:22 [SEVERE] at org.dynmap.bukkit.NewMapChunkCache.loadChunks(NewMapChunkCache.java:763)
13:48:22 [SEVERE] at org.dynmap.bukkit.DynmapPlugin$BukkitServer$7.call(DynmapPlugin.java:401)
13:48:22 [SEVERE] at org.dynmap.bukkit.DynmapPlugin$BukkitServer$7.call(DynmapPlugin.java:396)
13:48:22 [SEVERE] at org.bukkit.craftbukkit.scheduler.CraftFuture.run(CraftFuture.java:34)
13:48:22 [SEVERE] at com.bergerkiller.bukkit.nolagg.examine.TimedWrapper.run(TimedWrapper.java:27)
13:48:22 [SEVERE] at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:126)
13:48:22 [SEVERE] at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:510)
13:48:22 [SEVERE] at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
13:48:22 [SEVERE] at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)

If you don't want to reply and think you can help, login to my server
play.compulsivecraft.com
Go through spawn, rank up, and say something like "Im from Bukkit to help Droid"