Server Error- need help

What is causing this error? thanks





[19:28:21 WARN]: net.minecraft.server.v1_7_R4.ReportedException: Saving entity NBT
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.Entity.e(Entity.java:1143)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.Entity.d(Entity.java:1091)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.ChunkRegionLoader.a(ChunkRegionLoader.java:258)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.ChunkRegionLoader.a(ChunkRegionLoader.java:141)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.ChunkProviderServer.saveChunk(ChunkProviderServer.java:252)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.ChunkProviderServer.unloadChunks(ChunkProviderServer.java:346)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.WorldServer.doTick(WorldServer.java:196)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:690)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628)
[19:28:21 WARN]: Caused by: java.lang.NullPointerException
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.MerchantRecipe.i(MerchantRecipe.java:91)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.MerchantRecipeList.a(MerchantRecipeList.java:90)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.EntityVillager.b(SourceFile:166)
[19:28:21 WARN]:at net.minecraft.server.v1_7_R4.Entity.e(Entity.java:1130)

[19:28:21 WARN]:... 11 more

 

Could you post the whole crash log? I think you might have a corrupt chunk.