I keep getting this java.lang.StackOverflowError. I have even tried installing a new server but still.
Here is the error:
---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 6/24/20 12:03 PM
Description: Watching Server

java.lang.Error
at aom.cu(SourceFile:2813)
at aom.a(SourceFile:664)
at aoy.a(SourceFile:2142)
at aoy.f(SourceFile:2095)
at aoy.k(SourceFile:2544)
at aoz.k(SourceFile:538)
at bcb.k(SourceFile:42)
at bbk.k(SourceFile:127)
at aoy.j(SourceFile:2251)
at aoz.j(SourceFile:338)
at zd.a(SourceFile:615)
at zd$$Lambda$3381/878975.accept(Unknown Source)
at bqb.a(SourceFile:603)
at zd.a(SourceFile:405)
at net.minecraft.server.MinecraftServer.b(SourceFile:873)
at yd.b(SourceFile:306)
at net.minecraft.server.MinecraftServer.a(SourceFile:813)
at net.minecraft.server.MinecraftServer.v(SourceFile:672)
at net.minecraft.server.MinecraftServer.a(SourceFile:256)
at net.minecraft.server.MinecraftServer$$Lambda$3071/1511885.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

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

– Head –
Thread: Server Watchdog
Stacktrace:
at aom.cu(SourceFile:2813)
at aom.a(SourceFile:664)
at aoy.a(SourceFile:2142)
at aoy.f(SourceFile:2095)
at aoy.k(SourceFile:2544)
at aoz.k(SourceFile:538)
at bcb.k(SourceFile:42)
at bbk.k(SourceFile:127)
at aoy.j(SourceFile:2251)
at aoz.j(SourceFile:338)
at zd.a(SourceFile:615)
at zd$$Lambda$3381/878975.accept(Unknown Source)
at bqb.a(SourceFile:603)
at zd.a(SourceFile:405)
at net.minecraft.server.MinecraftServer.b(SourceFile:873)
at yd.b(SourceFile:306)
at net.minecraft.server.MinecraftServer.a(SourceFile:813)
at net.minecraft.server.MinecraftServer.v(SourceFile:672)
at net.minecraft.server.MinecraftServer.a(SourceFile:256)

– Thread Dump –
Details:
Threads: "Worker-Main-22" Id=53 WAITING on java.util.concurrent.ForkJoinPool@1f46bee
at sun.misc.Unsafe.park(Native Method)

• waiting on java.util.concurrent.ForkJoinPool@1f46bee
  at java.util.concurrent.ForkJoinPool.awaitWork(Unknown Source)
  at java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
  at java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)

"Worker-Main-21" Id=52 WAITING on java.util.concurrent.ForkJoinPool@1f46bee
at sun.misc.Unsafe.park(Native Method)

• waiting on java.util.concurrent.ForkJoinPool@1f46bee
  at java.util.concurrent.ForkJoinPool.awaitWork(Unknown Source)
  at java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
  at java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)

"Worker-Main-19" Id=50 WAITING on java.util.concurrent.ForkJoinPool@1f46bee
at sun.misc.Unsafe.park(Native Method)

• waiting on java.util.concurrent.ForkJoinPool@1f46bee
  at java.util.concurrent.ForkJoinPool.awaitWork(Unknown Source)
  at java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
  at java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)

"Netty Server IO #1" Id=46 RUNNABLE
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)

• locked io.netty.channel.nio.SelectedSelectionKeySet@1339960
• locked java.util.Collections$UnmodifiableSet@10c009e
• locked sun.nio.ch.WindowsSelectorImpl@e935b
  at sun.nio.ch.SelectorImpl.select(Unknown Source)
  at io.netty.channel.nio.SelectedSelectionKeySetSelector.select(SelectedSelectionKeySetSelector.java:62)
  at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:756)
  ...

"Server Watchdog" Id=45 RUNNABLE
at sun.management.ThreadImpl.dumpThreads0(Native Method)
at sun.management.ThreadImpl.dumpAllThreads(Unknown Source)
at yg.run(SourceFile:45)
at java.lang.Thread.run(Unknown Source)

"Worker-Main-15" Id=41 TIMED_WAITING on java.util.concurrent.ForkJoinPool@1f46bee
at sun.misc.Unsafe.park(Native Method)

• waiting on java.util.concurrent.ForkJoinPool@1f46bee
  at java.util.concurrent.ForkJoinPool.awaitWork(Unknown Source)
  at java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
  at java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)

"Netty Server IO #0" Id=40 RUNNABLE (in native)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)

• locked io.netty.channel.nio.SelectedSelectionKeySet@6136af
• locked java.util.Collections$UnmodifiableSet@1ec5ada
• locked sun.nio.ch.WindowsSelectorImpl@69a189
  at sun.nio.ch.SelectorImpl.select(Unknown Source)
  at io.netty.channel.nio.SelectedSelectionKeySetSelector.select(SelectedSelectionKeySetSelector.java:62)
  at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:756)
  ...

"ObjectCleanerThread" Id=39 TIMED_WAITING on java.lang.ref.ReferenceQueue$Lock@216c14
at java.lang.Object.wait(Native Method)

• waiting on java.lang.ref.ReferenceQueue$Lock@216c14
  at java.lang.ref.ReferenceQueue.remove(Unknown Source)
  at io.netty.util.internal.ObjectCleaner$1.run(ObjectCleaner.java:54)
  at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
  at java.lang.Thread.run(Unknown Source)

"DestroyJavaVM" Id=37 RUNNABLE

"Server thread" Id=26 RUNNABLE
at aom.cu(SourceFile:2813)
at aom.a(SourceFile:664)
at aoy.a(SourceFile:2142)
at aoy.f(SourceFile:2095)
at aoy.k(SourceFile:2544)
at aoz.k(SourceFile:538)
at bcb.k(SourceFile:42)
at bbk.k(SourceFile:127)
...

"Thread-3" Id=33 WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@190fff1
at sun.misc.Unsafe.park(Native Method)

• waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@190fff1
  at java.util.concurrent.locks.LockSupport.park(Unknown Source)
  at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
  at java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
  at com.mojang.util.QueueLogAppender.getNextLogEvent(QueueLogAppender.java:77)
  at yj.a(SourceFile:137)
  at yj$$Lambda$3086/28267362.run(Unknown Source)
  at java.lang.Thread.run(Unknown Source)

"TimerQueue" Id=34 TIMED_WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@16dcca9
at sun.misc.Unsafe.park(Native Method)

• waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@16dcca9
  at java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)
  at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source)
  at java.util.concurrent.DelayQueue.take(Unknown Source)
  at javax.swing.TimerQueue.run(Unknown Source)
  at java.lang.Thread.run(Unknown Source)

Number of locked synchronizers = 1

• java.util.concurrent.locks.ReentrantLock$NonfairSync@d14a13

"AWT-EventQueue-0" Id=32 WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@6f509c
at sun.misc.Unsafe.park(Native Method)

• waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@6f509c
  at java.util.concurrent.locks.LockSupport.park(Unknown Source)
  at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
  at java.awt.EventQueue.getNextEvent(Unknown Source)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
  at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
  ...

"AWT-Windows" Id=30 RUNNABLE (in native)
at sun.awt.windows.WToolkit.eventLoop(Native Method)
at sun.awt.windows.WToolkit.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

"AWT-Shutdown" Id=29 WAITING on java.lang.Object@aa5197
at java.lang.Object.wait(Native Method)

• waiting on java.lang.Object@aa5197
  at java.lang.Object.wait(Unknown Source)
  at sun.awt.AWTAutoShutdown.run(Unknown Source)
  at java.lang.Thread.run(Unknown Source)

"Java2D Disposer" Id=28 WAITING on java.lang.ref.ReferenceQueue$Lock@f70e83
at java.lang.Object.wait(Native Method)

• waiting on java.lang.ref.ReferenceQueue$Lock@f70e83
  at java.lang.ref.ReferenceQueue.remove(Unknown Source)
  at java.lang.ref.ReferenceQueue.remove(Unknown Source)
  at sun.java2d.Disposer.run(Unknown Source)
  at java.lang.Thread.run(Unknown Source)

"Snooper Timer" Id=27 WAITING on java.util.TaskQueue@11e95f0
at java.lang.Object.wait(Native Method)

• waiting on java.util.TaskQueue@11e95f0
  at java.lang.Object.wait(Unknown Source)
  at java.util.TimerThread.mainLoop(Unknown Source)
  at java.util.TimerThread.run(Unknown Source)

"Worker-Main-10" Id=21 WAITING on java.util.concurrent.ForkJoinPool@1f46bee
at sun.misc.Unsafe.park(Native Method)

• waiting on java.util.concurrent.ForkJoinPool@1f46bee
  at java.util.concurrent.ForkJoinPool.awaitWork(Unknown Source)
  at java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
  at java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)

"Worker-Main-9" Id=20 WAITING on java.util.concurrent.ForkJoinPool@1f46bee
at sun.misc.Unsafe.park(Native Method)

• waiting on java.util.concurrent.ForkJoinPool@1f46bee
  at java.util.concurrent.ForkJoinPool.awaitWork(Unknown Source)
  at java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
  at java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)

"Timer hack thread" Id=18 TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at v$2.run(SourceFile:524)

"Worker-Bootstrap-7" Id=17 RUNNABLE
at com.mojang.datafixers.functions.Apply.lambda$one$5(Apply.java:46)
at com.mojang.datafixers.functions.Apply$$Lambda$1032/31917317.get(Unknown Source)
at java.util.Optional.orElseGet(Unknown Source)
at com.mojang.datafixers.functions.Apply.one(Apply.java:46)
at com.mojang.datafixers.functions.PointFreeRule$One.rewrite(PointFreeRule.java:651)
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:571)
at com.mojang.datafixers.functions.Comp.one(Comp.java:43)
at com.mojang.datafixers.functions.PointFreeRule$One.rewrite(PointFreeRule.java:651)
...

"Worker-Bootstrap-6" Id=16 RUNNABLE
at com.mojang.datafixers.functions.PointFreeRule.one(PointFreeRule.java:597)
at com.mojang.datafixers.functions.PointFreeRule.lambda$once$3(PointFreeRule.java:601)
at com.mojang.datafixers.functions.PointFreeRule$$Lambda$422/19737280.get(Unknown Source)
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:571)
at com.mojang.datafixers.functions.Comp.lambda$one$4(Comp.java:44)
at com.mojang.datafixers.functions.Comp$$Lambda$1014/18270917.get(Unknown Source)
at java.util.Optional.orElseGet(Unknown Source)
at com.mojang.datafixers.functions.Comp.one(Comp.java:44)
...

"Worker-Bootstrap-5" Id=15 RUNNABLE
at java.lang.Class.isArray(Native Method)
at org.apache.commons.lang3.ObjectUtils.clone(ObjectUtils.java:671)
at com.mojang.datafixers.functions.PointFreeRule$CataFuseDifferent.doRewrite(PointFreeRule.java:456)
at com.mojang.datafixers.functions.PointFreeRule$CompRewrite.rewrite(PointFreeRule.java:190)
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:567)
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:571)
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:567)
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:567)
...

"Worker-Bootstrap-4" Id=14 RUNNABLE
at java.util.Objects.equals(Unknown Source)
at com.mojang.datafixers.types.templates.Sum.equals(Sum.java:143)
at java.util.Objects.equals(Unknown Source)
at com.mojang.datafixers.types.templates.Product.equals(Product.java:144)
at java.util.AbstractMap.equals(Unknown Source)
at java.util.Objects.equals(Unknown Source)
at com.mojang.datafixers.types.templates.TaggedChoice.equals(TaggedChoice.java:107)
at java.util.Objects.equals(Unknown Source)
...

"Worker-Bootstrap-3" Id=13 RUNNABLE
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:571)
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:571)
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:567)
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:567)
at com.mojang.datafixers.functions.Apply.one(Apply.java:45)
at com.mojang.datafixers.functions.PointFreeRule$One.rewrite(PointFreeRule.java:651)
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:571)
at com.mojang.datafixers.functions.Comp.lambda$one$4(Comp.java:44)
...

"Worker-Bootstrap-2" Id=12 RUNNABLE
at java.util.Objects.equals(Unknown Source)
at com.mojang.datafixers.functions.PointFreeRule$SortProj.doRewrite(PointFreeRule.java:253)
at com.mojang.datafixers.functions.PointFreeRule$CompRewrite.rewrite(PointFreeRule.java:180)
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:571)
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:567)
at com.mojang.datafixers.functions.Comp.one(Comp.java:43)
at com.mojang.datafixers.functions.PointFreeRule$One.rewrite(PointFreeRule.java:651)
at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:571)
...

"Worker-Bootstrap-1" Id=11 BLOCKED on java.lang.ref.Reference$Lock@143c5bf owned by "Worker-Bootstrap-6" Id=16
at com.mojang.datafixers.functions.Comp$$Lambda$1014/18270917.get$Lambda(Unknown Source)

• blocked on java.lang.ref.Reference$Lock@143c5bf
  at java.lang.invoke.LambdaForm$DMH/14289216.invokeStatic_L3_L(LambdaForm$DMH)
  at java.lang.invoke.LambdaForm$MH/11032138.linkToTargetMethod(LambdaForm$MH)
  at com.mojang.datafixers.functions.Comp.one(Comp.java:43)
  at com.mojang.datafixers.functions.PointFreeRule$One.rewrite(PointFreeRule.java:651)
  at com.mojang.datafixers.functions.PointFreeRule$OrElse.rewrite(PointFreeRule.java:571)
  at com.mojang.datafixers.functions.Comp.one(Comp.java:43)
  at com.mojang.datafixers.functions.PointFreeRule$One.rewrite(PointFreeRule.java:651)
  ...

"Attach Listener" Id=5 RUNNABLE

"Signal Dispatcher" Id=4 RUNNABLE

"Finalizer" Id=3 WAITING on java.lang.ref.ReferenceQueue$Lock@1511769
at java.lang.Object.wait(Native Method)

• waiting on java.lang.ref.ReferenceQueue$Lock@1511769
  at java.lang.ref.ReferenceQueue.remove(Unknown Source)
  at java.lang.ref.ReferenceQueue.remove(Unknown Source)
  at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)

"Reference Handler" Id=2 WAITING on java.lang.ref.Reference$Lock@143c5bf owned by "Worker-Bootstrap-6" Id=16
at java.lang.Object.wait(Native Method)

• waiting on java.lang.ref.Reference$Lock@143c5bf
  at java.lang.Object.wait(Unknown Source)
  at java.lang.ref.Reference.tryHandlePending(Unknown Source)
  at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)

Stacktrace:
at yg.run(SourceFile:61)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 1.16
Minecraft Version ID: 1.16
Operating System: Windows 10 (x86) version 10.0
Java Version: 1.8.0_251, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 31875232 bytes (30 MB) / 259522560 bytes (247 MB) up to 259522560 bytes (247 MB)
CPUs: 8
JVM Flags: 0 total;
Player Count: 1 / 20; [ze['RealDarkGamester'/71, l='ServerLevel[world]', x=139.30, y=63.00, z=-163.86]]
Data Packs: vanilla
Is Modded: Unknown (can't tell)
Type: Dedicated Server (map_server.txt)