Problem/Bug Please someone help me with this

Error Encountered an unexpected exception

java.lang.NullPointerException
Here is the error code on console:

Code:

Loading libraries, please wait...

[INFO] Starting minecraft server version 1.11.2

[INFO] Loading properties

[INFO] Default game type: SURVIVAL

[INFO] Generating keypair

[INFO] Starting Minecraft server on *:40709

[INFO] Using epoll channel type

[INFO] This server is running CraftBukkit version git-Bukkit-6e3cec8 (MC: 1.11.2) (Implementing API version 1.11.2-R0.1-SNAPSHOT)

[INFO] [WorldEdit] Loading WorldEdit v6.1.9;caf0ad9

[INFO] [Essentials] Loading Essentials vTeamCity

[INFO] [EssentialsChat] Loading EssentialsChat vTeamCity

[INFO] [GroupManager] Loading GroupManager v2.1.28 (Phoenix)

[INFO] [NBTEditor] Loading NBTEditor v2.2-SNAPSHOT

[INFO] [AgarthaLib] Loading AgarthaLib vMysthoria

[INFO] [ClearLag] Loading ClearLag v3.1.0

[INFO] [HolographicDisplays] Loading HolographicDisplays v2.4.0

[INFO] [EssentialsSpawn] Loading EssentialsSpawn vTeamCity

[INFO] [WorldGuard] Loading WorldGuard v6.1.3-SNAPSHOT;c904242

[INFO] [CratesPlus] Loading CratesPlus v4.5.2

[INFO] [MyItems] Loading MyItems vMysthoria

[INFO] [KitAdder] Loading KitAdder v2.6

[INFO] [MyPet] Loading MyPet v3.8

[INFO] [MyPet] Error-Reporter ENABLED

[INFO] [Shopkeepers] Loading Shopkeepers v2.2.2

[INFO] [CustomEnchantments] Loading CustomEnchantments v2.4c

[WARNING] **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!

[WARNING] The server will make no attempt to authenticate usernames. Beware.

[WARNING] While this makes the game possible to play without internet access, it also opens up the ability for hackers to connect with any username they choose.

[WARNING] To change this, set "online-mode" to "true" in the server.properties file.

[INFO] Preparing level "7A"

[INFO] Preparing start region for level 0 (Seed: 7436302479605564287)

[ERROR] Encountered an unexpected exception

java.lang.NullPointerException

at net.minecraft.server.v1_11_R1.NBTTagCompound.a(SourceFile:427) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.NBTTagCompound.load(SourceFile:76) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.NBTTagCompound.a(SourceFile:427) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.NBTTagCompound.load(SourceFile:76) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.NBTTagCompound.a(SourceFile:427) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.NBTTagCompound.load(SourceFile:76) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.NBTCompressedStreamTools.a(SourceFile:117) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.NBTCompressedStreamTools.a(SourceFile:82) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.NBTCompressedStreamTools.a(SourceFile:78) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.RegionFileCache.d(RegionFileCache.java:87) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.ChunkRegionLoader.loadChunk(ChunkRegionLoader.java:53) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at org.bukkit.craftbukkit.v1_11_R1.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:21) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at org.bukkit.craftbukkit.v1_11_R1.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:1) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at org.bukkit.craftbukkit.v1_11_R1.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:336) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at org.bukkit.craftbukkit.v1_11_R1.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:295) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at org.bukkit.craftbukkit.v1_11_R1.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:16) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:137) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:120) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:116) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.MinecraftServer.l(MinecraftServer.java:363) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.MinecraftServer.a(MinecraftServer.java:327) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.DedicatedServer.init(DedicatedServer.java:244) ~[craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:521) [craftbukkit-1.11.2.jar:git-Bukkit-6e3cec8]

at java.lang.Thread.run(Thread.java:813) [?:1.8.0_212]

[ERROR] This crash report has been saved to: /home/gs-40709/./crash-reports/crash-2019-11-02_09.28.21-server.txt

[INFO] Stopping server

[INFO] Saving players

[INFO] Saving worlds

[INFO] Saving chunks for level '7A'/Overworld

[INFO] Saving chunks for level '7A_nether'/Nether

[INFO] Saving chunks for level '7A_the_end'/The End
And here is in crash file:
---- Minecraft Crash Report ----
// I bet Cylons wouldn't have this problem.

Time: 11/2/19 9:28 AM
Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
    at net.minecraft.server.v1_11_R1.NBTTagCompound.a(SourceFile:427)
    at net.minecraft.server.v1_11_R1.NBTTagCompound.load(SourceFile:76)
    at net.minecraft.server.v1_11_R1.NBTTagCompound.a(SourceFile:427)
    at net.minecraft.server.v1_11_R1.NBTTagCompound.load(SourceFile:76)
    at net.minecraft.server.v1_11_R1.NBTTagCompound.a(SourceFile:427)
    at net.minecraft.server.v1_11_R1.NBTTagCompound.load(SourceFile:76)
    at net.minecraft.server.v1_11_R1.NBTCompressedStreamTools.a(SourceFile:117)
    at net.minecraft.server.v1_11_R1.NBTCompressedStreamTools.a(SourceFile:82)
    at net.minecraft.server.v1_11_R1.NBTCompressedStreamTools.a(SourceFile:78)
    at net.minecraft.server.v1_11_R1.RegionFileCache.d(RegionFileCache.java:87)
    at net.minecraft.server.v1_11_R1.ChunkRegionLoader.loadChunk(ChunkRegionLoader.java:53)
    at org.bukkit.craftbukkit.v1_11_R1.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:21)
    at org.bukkit.craftbukkit.v1_11_R1.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:1)
    at org.bukkit.craftbukkit.v1_11_R1.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:336)
    at org.bukkit.craftbukkit.v1_11_R1.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:295)
    at org.bukkit.craftbukkit.v1_11_R1.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:16)
    at net.minecraft.server.v1_11_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:137)
    at net.minecraft.server.v1_11_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:120)
    at net.minecraft.server.v1_11_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:116)
    at net.minecraft.server.v1_11_R1.MinecraftServer.l(MinecraftServer.java:363)
    at net.minecraft.server.v1_11_R1.MinecraftServer.a(MinecraftServer.java:327)
    at net.minecraft.server.v1_11_R1.DedicatedServer.init(DedicatedServer.java:244)
    at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:521)
    at java.lang.Thread.run(Thread.java:813)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
    Minecraft Version: 1.11.2
    Operating System: Linux (amd64) version 4.15.0-55-generic
    Java Version: 1.8.0_212, Eclipse OpenJ9
    Java VM Version: Eclipse OpenJ9 VM (JRE 1.8.0 Linux amd64-64-Bit Compressed References 20190417_286 (JIT enabled, AOT enabled)
OpenJ9   - bad1d4d06
OMR      - 4a4278e6
JCL      - 5590c4f818 based on jdk8u212-b03), Eclipse OpenJ9
    Memory: 870033024 bytes (829 MB) / 1073741824 bytes (1024 MB) up to 1073741824 bytes (1024 MB)
    JVM Flags: 9 total; -Xoptionsfile=/pro/bin/java/java8-openj9/lib/amd64/compressedrefs/options.default -Xlockword:mode=default,noLockword=java/lang/String,noLockword=java/util/MapEntry,noLockword=java/util/HashMap$Entry,noLockword=org/apache/harmony/luni/util/ModifiedMap$Entry,noLockword=java/util/Hashtable$Entry,noLockword=java/lang/invoke/MethodType,noLockword=java/lang/invoke/MethodHandle,noLockword=java/lang/invoke/CollectHandle,noLockword=java/lang/invoke/ConstructorHandle,noLockword=java/lang/invoke/ConvertHandle,noLockword=java/lang/invoke/ArgumentConversionHandle,noLockword=java/lang/invoke/AsTypeHandle,noLockword=java/lang/invoke/ExplicitCastHandle,noLockword=java/lang/invoke/FilterReturnHandle,noLockword=java/lang/invoke/DirectHandle,noLockword=java/lang/invoke/ReceiverBoundHandle,noLockword=java/lang/invoke/DynamicInvokerHandle,noLockword=java/lang/invoke/FieldHandle,noLockword=java/lang/invoke/FieldGetterHandle,noLockword=java/lang/invoke/FieldSetterHandle,noLockword=java/lang/invoke/StaticFieldGetterHandle,noLockword=java/lang/invoke/StaticFieldSetterHandle,noLockword=java/lang/invoke/IndirectHandle,noLockword=java/lang/invoke/InterfaceHandle,noLockword=java/lang/invoke/VirtualHandle,noLockword=java/lang/invoke/PrimitiveHandle,noLockword=java/lang/invoke/InvokeExactHandle,noLockword=java/lang/invoke/InvokeGenericHandle,noLockword=java/lang/invoke/VarargsCollectorHandle,noLockword=java/lang/invoke/ThunkTuple -Xjcl:jclse29 -XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap -XX:MaxRAMFraction=2 -Xms1024M -Xmx1024M -XX:-UsePerfData
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    CraftBukkit Information:
   Running: CraftBukkit version git-Bukkit-6e3cec8 (MC: 1.11.2) (Implementing API version 1.11.2-R0.1-SNAPSHOT) false
   Plugins: { WorldEdit v6.1.9;caf0ad9 com.sk89q.worldedit.bukkit.WorldEditPlugin [], Essentials vTeamCity com.earth2me.essentials.Essentials [Zenexer, ementalo, Aelux, Brettflan, KimKandor, snowleo, ceulemans, Xeology, KHobbits, md_5, Iaccidentally], EssentialsChat vTeamCity com.earth2me.essentials.chat.EssentialsChat [Zenexer, ementalo, Aelux, Brettflan, KimKandor, snowleo, ceulemans, Xeology, KHobbits, md_5, Okamosy, Iaccidentally], GroupManager v2.1.28 (Phoenix) org.anjocaido.groupmanager.GroupManager [AnjoCaido, Gabriel Couto, ElgarL], NBTEditor v2.2-SNAPSHOT com.goncalomb.bukkit.nbteditor.NBTEditor [goncalomb], AgarthaLib vMysthoria com.praya.agarthalib.f.a [Praya Amadiga Pitasa], ClearLag v3.1.0 me.minebuilders.clearlag.Clearlag [bob7l], HolographicDisplays v2.4.0 com.gmail.filoghost.holographicdisplays.HolographicDisplays [], EssentialsSpawn vTeamCity com.earth2me.essentials.spawn.EssentialsSpawn [Zenexer, ementalo, Aelux, Brettflan, KimKandor, snowleo, ceulemans, Xeology, KHobbits], WorldGuard v6.1.3-SNAPSHOT;c904242 com.sk89q.worldguard.bukkit.WorldGuardPlugin [], CratesPlus v4.5.2 plus.crates.CratesPlus [Connor Linfoot], MyItems vMysthoria com.praya.myitems.f.a [Praya Amadiga Pitasa], KitAdder v2.6 kitadder.KitAdder [], MyPet v3.8 de.Keyle.MyPet.MyPetPlugin [Keyle], Shopkeepers v2.2.2 com.nisovin.shopkeepers.SKShopkeepersPlugin [nisovin, blablubbabc], CustomEnchantments v2.4c com.taiter.ce.Main [],}
   Warnings: DEFAULT
   Reload Count: 0
   Threads: { RUNNABLE JIT Compilation Thread-0: [], RUNNABLE Thread-10: [java.lang.UNIXProcess.forkAndExec(Native Method), java.lang.UNIXProcess.<init>(UNIXProcess.java:247), java.lang.ProcessImpl.start(ProcessImpl.java:134), java.lang.ProcessBuilder.start(ProcessBuilder.java:1029), java.lang.Runtime.exec(Runtime.java:620), java.lang.Runtime.exec(Runtime.java:485), org.bukkit.craftbukkit.libs.jline.internal.TerminalLineSettings.exec(TerminalLineSettings.java:196), org.bukkit.craftbukkit.libs.jline.internal.TerminalLineSettings.exec(TerminalLineSettings.java:186), org.bukkit.craftbukkit.libs.jline.internal.TerminalLineSettings.stty(TerminalLineSettings.java:181), org.bukkit.craftbukkit.libs.jline.internal.TerminalLineSettings.get(TerminalLineSettings.java:74), org.bukkit.craftbukkit.libs.jline.internal.TerminalLineSettings.getProperty(TerminalLineSettings.java:95), org.bukkit.craftbukkit.libs.jline.UnixTerminal.getWidth(UnixTerminal.java:76), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.drawBuffer(ConsoleReader.java:879), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.drawBuffer(ConsoleReader.java:898), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.drawLine(ConsoleReader.java:608), org.bukkit.craftbukkit.v1_11_R1.util.TerminalConsoleWriterThread.run(TerminalConsoleWriterThread.java:40), java.lang.Thread.run(Thread.java:813)], RUNNABLE DestroyJavaVM helper thread: [], RUNNABLE MemoryMXBean notification dispatcher: [com.ibm.lang.management.internal.MemoryNotificationThread.processNotificationLoop(Native Method), com.ibm.lang.management.internal.MemoryNotificationThread.run(MemoryNotificationThread.java:183)], RUNNABLE Attach API wait loop: [com.ibm.tools.attach.target.IPC.waitSemaphore(Native Method), com.ibm.tools.attach.target.CommonDirectory.waitSemaphore(CommonDirectory.java:254), com.ibm.tools.attach.target.WaitLoop.waitForNotification(WaitLoop.java:66), com.ibm.tools.attach.target.WaitLoop.run(WaitLoop.java:154)], RUNNABLE JIT Compilation Thread-3 Suspended: [], RUNNABLE IProfiler: [], RUNNABLE JIT Compilation Thread-1 Suspended: [], RUNNABLE GC Slave: [], RUNNABLE JIT Compilation Thread-4 Suspended: [], RUNNABLE Concurrent Mark Helper: [], RUNNABLE GC Slave: [], RUNNABLE Server console handler: [java.io.FileInputStream.readBytes(Native Method), java.io.FileInputStream.read(FileInputStream.java:255), java.io.BufferedInputStream.fill(BufferedInputStream.java:246), java.io.BufferedInputStream.read(BufferedInputStream.java:265), org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.read(NonBlockingInputStream.java:169), org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.read(NonBlockingInputStream.java:137), org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.read(NonBlockingInputStream.java:246), org.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:261), org.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:198), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readCharacter(ConsoleReader.java:2145), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLine(ConsoleReader.java:2349), net.minecraft.server.v1_11_R1.DedicatedServer$2.run(DedicatedServer.java:83)], RUNNABLE Server thread: [java.lang.Thread.getStackTrace(Thread.java:1155), java.lang.Thread.getAllStackTraces(Thread.java:1183), org.bukkit.craftbukkit.v1_11_R1.CraftCrashReport.call(CraftCrashReport.java:30), net.minecraft.server.v1_11_R1.CrashReportSystemDetails.a(SourceFile:78), net.minecraft.server.v1_11_R1.CrashReport.h(CrashReport.java:126), net.minecraft.server.v1_11_R1.CrashReport.<init>(CrashReport.java:33), net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:571), java.lang.Thread.run(Thread.java:813)], WAITING Snooper Timer: [java.lang.Object.wait(Native Method), java.lang.Object.wait(Object.java:189), java.util.TimerThread.mainLoop(Timer.java:526), java.util.TimerThread.run(Timer.java:505)], RUNNABLE Finalizer thread: [], RUNNABLE JIT Compilation Thread-2 Suspended: [], TIMED_WAITING process reaper: [sun.misc.Unsafe.park(Native Method), java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215), java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:460), java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:362), java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:941), java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624), java.lang.Thread.run(Thread.java:813)], TIMED_WAITING JIT-SamplerThread: [], WAITING Java2D Disposer: [java.lang.Object.wait(Native Method), java.lang.Object.wait(Object.java:218), java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:138), java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:110), sun.java2d.Disposer.run(Disposer.java:148), java.lang.Thread.run(Thread.java:813)], RUNNABLE JIT Compilation Thread-5 Suspended: [], TIMED_WAITING Server Infinisleeper: [java.lang.Thread.sleep(Native Method), java.lang.Thread.sleep(Thread.java:943), net.minecraft.server.v1_11_R1.DedicatedServer$1.run(DedicatedServer.java:58)], WAITING NonBlockingInputStreamThread: [java.lang.Object.wait(Native Method), java.lang.Object.wait(Object.java:218), org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.run(NonBlockingInputStream.java:278), java.lang.Thread.run(Thread.java:813)], RUNNABLE Netty Epoll Server IO #0: [io.netty.channel.epoll.Native.epollWait(Native Method), io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:194), io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:219), io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116), java.lang.Thread.run(Thread.java:813)], RUNNABLE VM Runtime State Listener: [], RUNNABLE JIT Compilation Thread-6 Suspended: [], RUNNABLE JIT Diagnostic Compilation Thread-7 Suspended: [],}
   Recent tasks from -31--1{}
    Profiler Position: N/A (disabled)
    Player Count: 0 / 10; []
    Is Modded: Definitely; Server brand changed to 'CraftBukkit'
    Type: Dedicated Server (map_server.txt)

I search this error on google but it doesn't work. Someone help me please