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[Solved] Getting this Error when I try to Open my GUI that crashes the game


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Heya, I just made a GUI and am attempting to test it in game, but whenever I tap the block with said GUI, I get this error and my game crashes:

 

[17:19:15] [Server thread/FATAL] [minecraft/ThreadTaskExecutor]: Error executing task on Server
java.lang.NullPointerException: null
    at net.minecraftforge.items.SlotItemHandler.getStack(SlotItemHandler.java:54) ~[forge:?] {re:classloading}
    at net.minecraft.inventory.container.Container.getInventory(Container.java:121) ~[forge:?] {re:classloading}
    at net.minecraft.inventory.container.Container.addListener(Container.java:101) ~[forge:?] {re:classloading}
    at net.minecraftforge.fml.network.NetworkHooks.openGui(NetworkHooks.java:228) ~[forge:?] {re:classloading}
    at net.minecraftforge.fml.network.NetworkHooks.openGui(NetworkHooks.java:188) ~[forge:?] {re:classloading}
    at com.thamajorn.scullery.blocks.Cuttingboard.onBlockActivated(Cuttingboard.java:121) ~[?:?] {re:classloading}
    at net.minecraft.block.AbstractBlock$AbstractBlockState.onBlockActivated(AbstractBlock.java:730) ~[forge:?] {re:classloading}
    at net.minecraft.server.management.PlayerInteractionManager.func_219441_a(PlayerInteractionManager.java:347) ~[forge:?] {re:classloading}
    at net.minecraft.network.play.ServerPlayNetHandler.processTryUseItemOnBlock(ServerPlayNetHandler.java:986) ~[forge:?] {re:classloading}
    at net.minecraft.network.play.client.CPlayerTryUseItemOnBlockPacket.processPacket(CPlayerTryUseItemOnBlockPacket.java:45) ~[forge:?] {re:classloading}
    at net.minecraft.network.play.client.CPlayerTryUseItemOnBlockPacket.processPacket(CPlayerTryUseItemOnBlockPacket.java:12) ~[forge:?] {re:classloading}
    at net.minecraft.network.PacketThreadUtil.lambda$checkThreadAndEnqueue$0(PacketThreadUtil.java:19) ~[forge:?] {re:classloading}
    at net.minecraft.util.concurrent.TickDelayedTask.run(TickDelayedTask.java:20) ~[forge:?] {re:classloading}
    at net.minecraft.util.concurrent.ThreadTaskExecutor.run(ThreadTaskExecutor.java:139) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.util.concurrent.RecursiveEventLoop.run(RecursiveEventLoop.java:22) ~[forge:?] {re:classloading}
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:758) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:159) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.util.concurrent.ThreadTaskExecutor.driveOne(ThreadTaskExecutor.java:109) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.driveOneInternal(MinecraftServer.java:741) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.driveOne(MinecraftServer.java:735) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.util.concurrent.ThreadTaskExecutor.driveUntil(ThreadTaskExecutor.java:122) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.runScheduledTasks(MinecraftServer.java:721) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:667) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.lambda$startServer$0(MinecraftServer.java:233) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_261] {}
[17:19:15] [Server thread/FATAL] [ne.mi.co.ForgeMod/]: Preparing crash report with UUID 03ce1766-0f70-44d1-a1e0-bd03f5bb8d8e
[17:19:15] [Server thread/ERROR] [minecraft/MinecraftServer]: Encountered an unexpected exception
net.minecraft.crash.ReportedException: Ticking entity
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:888) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:820) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:84) ~[forge:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:663) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.lambda$startServer$0(MinecraftServer.java:233) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_261] {}
Caused by: java.lang.NullPointerException
    at net.minecraftforge.items.SlotItemHandler.getStack(SlotItemHandler.java:54) ~[forge:?] {re:classloading}
    at net.minecraft.inventory.container.Container.detectAndSendChanges(Container.java:132) ~[forge:?] {re:classloading}
    at net.minecraft.entity.player.ServerPlayerEntity.tick(ServerPlayerEntity.java:378) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.world.server.ServerWorld.updateEntity(ServerWorld.java:623) ~[forge:?] {re:classloading}
    at net.minecraft.world.World.guardEntityTick(World.java:601) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.world.server.ServerWorld.tick(ServerWorld.java:407) ~[forge:?] {re:classloading}
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:884) ~[forge:?] {re:classloading,pl:accesstransformer:B}
    ... 5 more

 

I'll be checking around for a solution myself, but if not, if anyone can point me in the right direction, that would be much appreciated.

 

Here's my github on the project: https://github.com/TheMajorN/sculleryProject/tree/main/src/main/java/com/thamajorn/scullery

(And yes, I'm in the process of fixing the file names to UpperCamelCase)

Edited by TheMajorN
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