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 December 27, 20204 yr by TheMajorN
Issue was resolved

Oh my god thank you so much.  I changed super to this and it worked just fine.