MCreator Mod Multiplayer Crash

So, I have been developing a mod for Minecraft 1.15.2 and I constantly get this crash when playing in a server, I'll add the crash report below:

Time: 1/17/21 9:11 PM
Description: Ticking entity

java.lang.ClassCastException: net.minecraft.client.entity.player.RemoteClientPlayerEntity cannot be cast to net.minecraft.client.entity.player.ClientPlayerEntity
    at net.mcreator.afterwarmod.procedures.Y50WarningProcedure$1.checkGamemode(Y50WarningProcedure.java:72) ~[?:?] {re:classloading}
    at net.mcreator.afterwarmod.procedures.Y50WarningProcedure.executeProcedure(Y50WarningProcedure.java:78) ~[?:?] {re:classloading}
    at net.mcreator.afterwarmod.procedures.Y50WarningProcedure.onPlayerTick(Y50WarningProcedure.java:176) ~[?:?] {re:classloading}
    at net.minecraftforge.eventbus.ASMEventHandler_6_Y50WarningProcedure_onPlayerTick_PlayerTickEvent.invoke(.dynamic) ~[?:?] {}
    at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80) ~[eventbus-2.2.0-service.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258) ~[eventbus-2.2.0-service.jar:?] {}
    at net.minecraftforge.fml.hooks.BasicEventHooks.onPlayerPostTick(BasicEventHooks.java:89) ~[?:?] {re:classloading}
    at net.minecraft.entity.player.PlayerEntity.func_70071_h_(PlayerEntity.java:280) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:fml:xaerominimap:xaero_playerentity_iswearing}
    at net.minecraft.client.entity.player.RemoteClientPlayerEntity.func_70071_h_(RemoteClientPlayerEntity.java:36) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.world.ClientWorld.func_217418_a(ClientWorld.java:235) ~[?:?] {re:mixin,re:classloading,xf:OptiFine:default,xf:fml:xaerominimap:xaero_clientworldclass,pl:mixin:APP:mixins.sndctrl.json:MixinClientWorld,pl:mixin:A}
    at net.minecraft.client.world.ClientWorld$$Lambda$4852/602011152.accept(Unknown Source) ~[?:?] {}
    at net.minecraft.world.World.func_217390_a(World.java:536) ~[?:?] {re:classloading,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B}
    at net.minecraft.client.world.ClientWorld.func_217419_d(ClientWorld.java:196) ~[?:?] {re:mixin,re:classloading,xf:OptiFine:default,xf:fml:xaerominimap:xaero_clientworldclass,pl:mixin:APP:mixins.sndctrl.json:MixinClientWorld,pl:mixin:A}
    at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1398) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:904) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:553) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.main.Main.main(SourceFile:204) [?:?] {re:classloading}
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51] {}
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51] {}
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] {}
    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) [forge-1.15.2-31.2.45.jar:31.2] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$434/685219002.call(Unknown Source) [forge-1.15.2-31.2.45.jar:31.2] {}
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-5.1.2.jar:?] {}

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

-- Head --
Thread: Render thread
Stacktrace:
    at net.mcreator.afterwarmod.procedures.Y50WarningProcedure$1.checkGamemode(Y50WarningProcedure.java:72)
    at net.mcreator.afterwarmod.procedures.Y50WarningProcedure.executeProcedure(Y50WarningProcedure.java:78)
    at net.mcreator.afterwarmod.procedures.Y50WarningProcedure.onPlayerTick(Y50WarningProcedure.java:176)
    at net.minecraftforge.eventbus.ASMEventHandler_6_Y50WarningProcedure_onPlayerTick_PlayerTickEvent.invoke(.dynamic)
    at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80)
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258)
    at net.minecraftforge.fml.hooks.BasicEventHooks.onPlayerPostTick(BasicEventHooks.java:89)
    at net.minecraft.entity.player.PlayerEntity.func_70071_h_(PlayerEntity.java:280)
    at net.minecraft.client.entity.player.RemoteClientPlayerEntity.func_70071_h_(RemoteClientPlayerEntity.java:36)
    at net.minecraft.client.world.ClientWorld.func_217418_a(ClientWorld.java:235)
    at net.minecraft.client.world.ClientWorld$$Lambda$4852/602011152.accept(Unknown Source)

-- Entity being ticked --
Details:
    Entity Type: minecraft:player (net.minecraft.client.entity.player.RemoteClientPlayerEntity)
    Entity ID: 10181
    Entity Name: Jp_2003
    Entity's Exact location: 391.02, 67.18, -150.45
    Entity's Block location: World: (391,67,-151), Chunk: (at 7,4,9 in 24,-10; contains blocks 384,0,-160 to 399,255,-145), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
    Entity's Momentum: 0.00, 0.00, 0.00
    Entity's Passengers: []
    Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
    at net.minecraft.world.World.func_217390_a(World.java:536)
    at net.minecraft.client.world.ClientWorld.func_217419_d(ClientWorld.java:196)

-- Affected level --
Details:
    All players: 2 total; [ClientPlayerEntity['LaTortiia45'/10624, l='MpServer', x=350.94, y=98.00, z=-79.63], RemoteClientPlayerEntity['Jp_2003'/10181, l='MpServer', x=391.02, y=67.18, z=-150.45]]
    Chunk stats: Client Chunk Cache: 625, 392
    Level dimension: DimensionType{minecraft:overworld}
    Level name: MpServer
    Level seed: 7137162854360910884
    Level generator: ID 00 - default, ver 1. Features enabled: false
    Level generator options: {}
    Level spawn location: World: (-208,64,-208), Chunk: (at 0,4,0 in -13,-13; contains blocks -208,0,-208 to -193,255,-193), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
    Level time: 173101 game time, 173101 day time
    Known server brands: 
    Level was modded: false
    Level storage version: 0x00000 - Unknown?
    Level weather: Rain time: 0 (now: true), thunder time: 0 (now: false)
    Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
    Server brand: forge
    Server type: Non-integrated multiplayer server
Stacktrace:
    at net.minecraft.client.world.ClientWorld.func_72914_a(ClientWorld.java:611)
    at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:1763)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:567)
    at net.minecraft.client.main.Main.main(SourceFile:204)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51)
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$434/685219002.call(Unknown Source)
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:81)
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:65)

I think it has to do with a procedure called Y=50 but I can't understand the problem with it, if anyone can help me it would honestly get awsome!!