I can´t join on my Server

Code:

[Server thread/ERROR]: Cause of unexpected exception was
java.io.UTFDataFormatException: malformed input around byte 11
at java.io.DataInputStream.readUTF(DataInputStream.java:656) ~[?:1.8.0_121]
at java.io.DataInputStream.readUTF(DataInputStream.java:564) ~[?:1.8.0_121]
at net.minecraft.server.v1_8_R1.NBTTagString.load(SourceFile:28) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.NBTTagCompound.a(SourceFile:380) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.NBTTagCompound.load(SourceFile:48) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.NBTTagList.load(NBTTagList.java:53) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.NBTTagCompound.a(SourceFile:380) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.NBTTagCompound.load(SourceFile:48) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.NBTTagList.load(NBTTagList.java:53) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.NBTTagCompound.a(SourceFile:380) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.NBTTagCompound.load(SourceFile:48) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.NBTTagCompound.a(SourceFile:380) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.NBTTagCompound.load(SourceFile:48) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.NBTCompressedStreamTools.a(NBTCompressedStreamTools.java:92) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.NBTCompressedStreamTools.a(NBTCompressedStreamTools.java:57) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.NBTCompressedStreamTools.a(NBTCompressedStreamTools.java:46) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.ChunkRegionLoader.loadChunk(ChunkRegionLoader.java:83) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at org.bukkit.craftbukkit.v1_8_R1.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:19) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at org.bukkit.craftbukkit.v1_8_R1.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:1) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at org.bukkit.craftbukkit.v1_8_R1.util.AsynchronousExecutor$Task.init(AsynchronousExecutor.java:150) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at org.bukkit.craftbukkit.v1_8_R1.util.AsynchronousExecutor$Task.initAsync(AsynchronousExecutor.java:95) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at org.bukkit.craftbukkit.v1_8_R1.util.AsynchronousExecutor$Task.run(AsynchronousExecutor.java:85) ~[minecraft_server.jar:git-Spigot-550ebac-7019900]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_121]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_121]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]

 

@Minigamer123

1. Why are you still on 1.8? There is no reason to stay on an outdated version. Update your server.
2. The issue seems to be that a bad packet is being sent. Are you sure you have a valid client, and that your client's version matches the server version? My mistake; this has to do with NBT tags.

 

@Minigamer123
One of your NBT files is corrupt. It seems to be a chunk. Try going into something like MCEdit to fix it (it should be one of the chunks where your player is located.