Problem/Bug Crash Error

Code:

16:28:59] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.server.v1_7_R4.ReportedException: Loading entity NBT
    at net.minecraft.server.v1_7_R4.Entity.f(Entity.java:1275) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.EntityTypes.a(SourceFile:155) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.ChunkRegionLoader.loadEntities(ChunkRegionLoader.java:354) ~[custom.jar:git-PaperSpigot-a925999]
    at org.bukkit.craftbukkit.v1_7_R4.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:37) ~[custom.jar:git-PaperSpigot-a925999]
    at org.bukkit.craftbukkit.v1_7_R4.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:13) ~[custom.jar:git-PaperSpigot-a925999]
    at org.bukkit.craftbukkit.v1_7_R4.util.AsynchronousExecutor$Task.finish(AsynchronousExecutor.java:188) ~[custom.jar:git-PaperSpigot-a925999]
    at org.bukkit.craftbukkit.v1_7_R4.util.AsynchronousExecutor.finishActive(AsynchronousExecutor.java:347) ~[custom.jar:git-PaperSpigot-a925999]
    at org.bukkit.craftbukkit.v1_7_R4.chunkio.ChunkIOExecutor.tick(ChunkIOExecutor.java:34) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:720) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:286) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:651) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:557) [custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [custom.jar:git-PaperSpigot-a925999]
Caused by: java.lang.IllegalArgumentException: Invalid UUID string: Pained
    at java.util.UUID.fromString(UUID.java:194) ~[?:1.8.0_121]
    at net.minecraft.server.v1_7_R4.EntityItem.a(EntityItem.java:266) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.Entity.f(Entity.java:1214) ~[custom.jar:git-PaperSpigot-a925999]
    ... 12 more
[16:28:59] [Server thread/ERROR]:     Cause of unexpected exception was
java.lang.IllegalArgumentException: Invalid UUID string: Pained
    at java.util.UUID.fromString(UUID.java:194) ~[?:1.8.0_121]
    at net.minecraft.server.v1_7_R4.EntityItem.a(EntityItem.java:266) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.Entity.f(Entity.java:1214) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.EntityTypes.a(SourceFile:155) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.ChunkRegionLoader.loadEntities(ChunkRegionLoader.java:354) ~[custom.jar:git-PaperSpigot-a925999]
    at org.bukkit.craftbukkit.v1_7_R4.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:37) ~[custom.jar:git-PaperSpigot-a925999]
    at org.bukkit.craftbukkit.v1_7_R4.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:13) ~[custom.jar:git-PaperSpigot-a925999]
    at org.bukkit.craftbukkit.v1_7_R4.util.AsynchronousExecutor$Task.finish(AsynchronousExecutor.java:188) ~[custom.jar:git-PaperSpigot-a925999]
    at org.bukkit.craftbukkit.v1_7_R4.util.AsynchronousExecutor.finishActive(AsynchronousExecutor.java:347) ~[custom.jar:git-PaperSpigot-a925999]
    at org.bukkit.craftbukkit.v1_7_R4.chunkio.ChunkIOExecutor.tick(ChunkIOExecutor.java:34) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:720) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:286) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:651) ~[custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:557) [custom.jar:git-PaperSpigot-a925999]
    at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [custom.jar:git-PaperSpigot-a925999]
[16:28:59] [Server thread/ERROR]: This crash report has been saved to: /root/servers/HCF/./crash-reports/crash-2017-02-18_16.28.59-server.txt
[16:28:59] [Server thread/INFO]: Stopping server