[Server 1.12.2] Watching Server problem

I'm trying to start this world with Pixelmon and Tinkers but everytime my other player enters the server it crashes. The server crash report firstly stated that it was "Exception in Server Tick loop" but seems that I fixed that. Now it is stating the Watching server thing as follows:

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 10/05/20 11:48
Description: Watching Server

java.lang.Error: ServerHangWatchdog detected that a single server tick took 60,27 seconds (should be max 0.05)
    at net.minecraftforge.registries.GameData$BlockCallbacks$1.get(GameData.java:387)
    at net.minecraftforge.registries.GameData$BlockCallbacks$1.func_148747_b(GameData.java:382)
    at net.minecraft.world.chunk.BlockStateContainer.func_186017_a(BlockStateContainer.java:136)
    at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75820_a(AnvilChunkLoader.java:325)
    at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75816_a(AnvilChunkLoader.java:174)
    at net.minecraft.world.gen.ChunkProviderServer.func_73242_b(ChunkProviderServer.java:202)
    at net.minecraft.world.gen.ChunkProviderServer.func_73156_b(ChunkProviderServer.java:271)
    at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:207)
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:756)
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397)
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
    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 net.minecraftforge.registries.GameData$BlockCallbacks$1.get(GameData.java:387)
    at net.minecraftforge.registries.GameData$BlockCallbacks$1.func_148747_b(GameData.java:382)
    at net.minecraft.world.chunk.BlockStateContainer.func_186017_a(BlockStateContainer.java:136)
    at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75820_a(AnvilChunkLoader.java:325)
    at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75816_a(AnvilChunkLoader.java:174)
    at net.minecraft.world.gen.ChunkProviderServer.func_73242_b(ChunkProviderServer.java:202)
    at net.minecraft.world.gen.ChunkProviderServer.func_73156_b(ChunkProviderServer.java:271)
    at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:207)
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:756)
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397)
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)

-- Thread Dump --
Details:
    Threads: "Netty Server IO #4" Id=46 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$400(Unknown Source)
    at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
    -  locked io.netty.channel.nio.SelectedSelectionKeySet@ba149e
    -  locked java.util.Collections$UnmodifiableSet@7de479
    -  locked sun.nio.ch.WindowsSelectorImpl@427fee
    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:732)
    ...

"Netty Server IO #3" Id=45 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$400(Unknown Source)
    at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
    -  locked io.netty.channel.nio.SelectedSelectionKeySet@140ee42
    -  locked java.util.Collections$UnmodifiableSet@1fa0350
    -  locked sun.nio.ch.WindowsSelectorImpl@b172fa
    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:732)
    ...

"Chunk I/O Executor Thread-1" Id=43 WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@1e1c14d
    at sun.misc.Unsafe.park(Native Method)
    -  waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@1e1c14d
    at java.util.concurrent.locks.LockSupport.park(Unknown Source)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
    at java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

"Netty Server IO #2" Id=39 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$400(Unknown Source)
    at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
    -  locked io.netty.channel.nio.SelectedSelectionKeySet@16f110d
    -  locked java.util.Collections$UnmodifiableSet@4079b3
    -  locked sun.nio.ch.WindowsSelectorImpl@1e7ef63
    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:732)
    ...

"threadDeathWatcher-2-1" Id=38 TIMED_WAITING
    at java.lang.Thread.sleep(Native Method)
    at io.netty.util.ThreadDeathWatcher$Watcher.run(ThreadDeathWatcher.java:152)
    at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
    at java.lang.Thread.run(Unknown Source)

"Netty Server IO #1" Id=37 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$400(Unknown Source)
    at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
    -  locked io.netty.channel.nio.SelectedSelectionKeySet@e5af3b
    -  locked java.util.Collections$UnmodifiableSet@1212ed3
    -  locked sun.nio.ch.WindowsSelectorImpl@3b5965
    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:732)
    ...

"File IO Thread" Id=36 TIMED_WAITING
    at java.lang.Thread.sleep(Native Method)
    at net.minecraft.world.storage.ThreadedFileIOBase.func_75736_b(SourceFile:44)
    at net.minecraft.world.storage.ThreadedFileIOBase.run(SourceFile:30)
    at java.lang.Thread.run(Unknown Source)

"World Spawner" Id=35 RUNNABLE
    at java.util.ArrayList.indexOf(Unknown Source)
    at java.util.ArrayList.contains(Unknown Source)
    at com.pixelmonmod.pixelmon.api.spawning.calculators.ICalculateSpawnLocations.calculateSpawnableLocations(ICalculateSpawnLocations.java:151)
    at com.pixelmonmod.pixelmon.spawning.PlayerTrackingSpawner.lambda$getSpawns$1(PlayerTrackingSpawner.java:148)
    at com.pixelmonmod.pixelmon.spawning.PlayerTrackingSpawner$$Lambda$313/30886380.run(Unknown Source)
    at com.pixelmonmod.pixelmon.api.spawning.SpawnerCoordinator$Processor.run(SpawnerCoordinator.java:104)
    at java.util.TimerThread.mainLoop(Unknown Source)
    at java.util.TimerThread.run(Unknown Source)

"Server Watchdog" Id=34 RUNNABLE
    at sun.management.ThreadImpl.dumpThreads0(Native Method)
    at sun.management.ThreadImpl.dumpAllThreads(Unknown Source)
    at net.minecraft.server.dedicated.ServerHangWatchdog.run(ServerHangWatchdog.java:45)
    at java.lang.Thread.run(Unknown Source)

"Netty Server IO #0" Id=33 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$400(Unknown Source)
    at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
    -  locked io.netty.channel.nio.SelectedSelectionKeySet@8d3bf6
    -  locked java.util.Collections$UnmodifiableSet@1c0dceb
    -  locked sun.nio.ch.WindowsSelectorImpl@1412bf6
    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:732)
    ...

"DestroyJavaVM" Id=25 RUNNABLE

"Server thread" Id=23 RUNNABLE
    at net.minecraftforge.registries.GameData$BlockCallbacks$1.get(GameData.java:387)
    at net.minecraftforge.registries.GameData$BlockCallbacks$1.func_148747_b(GameData.java:382)
    at net.minecraft.world.chunk.BlockStateContainer.func_186017_a(BlockStateContainer.java:136)
    at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75820_a(AnvilChunkLoader.java:325)
    at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75816_a(AnvilChunkLoader.java:174)
    at net.minecraft.world.gen.ChunkProviderServer.func_73242_b(ChunkProviderServer.java:202)
    at net.minecraft.world.gen.ChunkProviderServer.func_73156_b(ChunkProviderServer.java:271)
    at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:207)
    ...

"TimerQueue" Id=21 TIMED_WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@7a61d3
    at sun.misc.Unsafe.park(Native Method)
    -  waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@7a61d3
    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@123a64a

"Thread-3" Id=20 WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@1e8dd33
    at sun.misc.Unsafe.park(Native Method)
    -  waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@1e8dd33
    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 net.minecraft.server.gui.MinecraftServerGui$4.run(MinecraftServerGui.java:154)
    at java.lang.Thread.run(Unknown Source)

"AWT-EventQueue-0" Id=19 WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@19a5163
    at sun.misc.Unsafe.park(Native Method)
    -  waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@19a5163
    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=17 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=16 WAITING on java.lang.Object@161b26c
    at java.lang.Object.wait(Native Method)
    -  waiting on java.lang.Object@161b26c
    at java.lang.Object.wait(Unknown Source)
    at sun.awt.AWTAutoShutdown.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

"Java2D Disposer" Id=15 WAITING on java.lang.ref.ReferenceQueue$Lock@3a26aa
    at java.lang.Object.wait(Native Method)
    -  waiting on java.lang.ref.ReferenceQueue$Lock@3a26aa
    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)

"Server Infinisleeper" Id=14 TIMED_WAITING
    at java.lang.Thread.sleep(Native Method)
    at net.minecraft.server.dedicated.DedicatedServer$1.run(DedicatedServer.java:82)

"Snooper Timer" Id=13 TIMED_WAITING on java.util.TaskQueue@1347edb
    at java.lang.Object.wait(Native Method)
    -  waiting on java.util.TaskQueue@1347edb
    at java.util.TimerThread.mainLoop(Unknown Source)
    at java.util.TimerThread.run(Unknown Source)

"Attach Listener" Id=5 RUNNABLE

"Signal Dispatcher" Id=4 RUNNABLE

"Finalizer" Id=3 WAITING on java.lang.ref.ReferenceQueue$Lock@d23b17
    at java.lang.Object.wait(Native Method)
    -  waiting on java.lang.ref.ReferenceQueue$Lock@d23b17
    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$Lock@e218b3
    at java.lang.Object.wait(Native Method)
    -  waiting on java.lang.ref.Reference$Lock@e218b3
    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 net.minecraft.server.dedicated.ServerHangWatchdog.run(ServerHangWatchdog.java:62)
    at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
    Minecraft Version: 1.12.2
    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: 42749544 bytes (40 MB) / 259522560 bytes (247 MB) up to 259522560 bytes (247 MB)
    JVM Flags: 0 total; 
    IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
    FML: MCP 9.42 Powered by Forge 14.23.5.2847 7 mods loaded, 7 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

    | State  | ID         | Version           | Source                                  | Signature |
    |:------ |:---------- |:----------------- |:--------------------------------------- |:--------- |
    | LCHIJA | minecraft  | 1.12.2            | minecraft.jar                           | None      |
    | LCHIJA | mcp        | 9.42              | minecraft.jar                           | None      |
    | LCHIJA | FML        | 8.0.99.99         | forge-1.12.2-14.23.5.2847-universal.jar | None      |
    | LCHIJA | forge      | 14.23.5.2847      | forge-1.12.2-14.23.5.2847-universal.jar | None      |
    | LCHIJA | mantle     | 1.12-1.3.3.55     | Mantle-Mod-1.12.2.jar                   | None      |
    | LCHIJA | pixelmon   | 7.0.7             | Pixelmon-1.12.2-7.0.7-universal.jar     | None      |
    | LCHIJA | tconstruct | 1.12.2-2.12.0.115 | Tinkers-Construct-Mod-1.12.2.jar        | None      |

    Loaded coremods (and transformers): 
    Pulsar/tconstruct loaded Pulses: 
        - TinkerCommons (Enabled/Forced)
        - TinkerWorld (Enabled/Not Forced)
        - TinkerTools (Enabled/Not Forced)
        - TinkerHarvestTools (Enabled/Forced)
        - TinkerMeleeWeapons (Enabled/Forced)
        - TinkerRangedWeapons (Enabled/Forced)
        - TinkerModifiers (Enabled/Forced)
        - TinkerSmeltery (Enabled/Not Forced)
        - TinkerGadgets (Enabled/Not Forced)
        - TinkerOredict (Enabled/Forced)
        - TinkerIntegration (Enabled/Forced)
        - TinkerFluids (Enabled/Forced)
        - TinkerMaterials (Enabled/Forced)
        - TinkerModelRegister (Enabled/Forced)

    Profiler Position: N/A (disabled)
    Player Count: 2 / 20; [EntityPlayerMP['ScMarc19'/176, l='world', x=127,61, y=65,00, z=348,45], EntityPlayerMP['Bakuradan'/202, l='world', x=102,50, y=70,00, z=252,50]]
    Is Modded: Definitely; Server brand changed to 'fml,forge'
    Type: Dedicated Server (map_server.txt)