Hello There! I placed a World Scanner block and suddenly my server crashed? Added not enough crashes and Erroring Entity Remover and nothing changed. I currently am not able to log in because the server crashes whenever I launch it!

Not sure if this is anything I can fix on my end or if I need to start a new world or...?
Any help is greatly appreciated! Thanks in advance! 👍

---- Minecraft Crash Report ----
// Why did you do that?

Time: 7/13/22, 4:37 PM
Description: Ticking block entity

java.lang.NullPointerException: Cannot invoke "net.minecraft.class_3218.method_8497(int, int)" because "scanLevel" is null
at xyz.immortius.chunkbychunk.common.blockEntities.WorldScannerBlockEntity.serverTick(WorldScannerBlockEntity.java:208)
at net.minecraft.world.chunk.WorldChunk$DirectBlockEntityTickInvoker.tick(WorldChunk:659)
at net.minecraft.world.chunk.WorldChunk$WrappedBlockEntityTickInvoker.tick(WorldChunk:713)
at net.minecraft.world.World.tickBlockEntities(World:475)
at net.minecraft.server.world.ServerWorld.tick(ServerWorld:368)
at net.minecraft.server.MinecraftServer.tickWorlds(MinecraftServer:907)
at net.minecraft.server.dedicated.MinecraftDedicatedServer.tickWorlds(MinecraftDedicatedServer:322)
at net.minecraft.server.MinecraftServer.tick(MinecraftServer:851)
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer:697)
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer:273)
at java.lang.Thread.run(Thread.java:833)

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

-- Head --
Thread: Server thread
Stacktrace:
at xyz.immortius.chunkbychunk.common.blockEntities.WorldScannerBlockEntity.serverTick(WorldScannerBlockEntity.java:208)
at net.minecraft.class_2818$class_5563.method_31703(class_2818.java:659)
at net.minecraft.class_2818$class_5564.method_31703(class_2818.java:713)
at net.minecraft.class_1937.method_18471(class_1937.java:475)
at net.minecraft.class_3218.method_18765(class_3218.java:368)

-- Block entity being ticked --
Details:
Name: chunkbychunk:worldscannerentity // xyz.immortius.chunkbychunk.common.blockEntities.WorldScannerBlockEntity
Block: Block{chunkbychunk:worldscanner}
Block location: World: (8,61,-27), Section: (at 8,13,5 in 0,3,-2; chunk contains blocks 0,-64,-32 to 15,319,-17), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,-64,-512 to 511,319,-1)
Block: Block{chunkbychunk:worldscanner}
Block location: World: (8,61,-27), Section: (at 8,13,5 in 0,3,-2; chunk contains blocks 0,-64,-32 to 15,319,-17), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,-64,-512 to 511,319,-1)
Block Entity NBT: {ChargedFuel:32,Items:[{Count:1b,Slot:0b,id:"minecraft:raw_iron"},{Count:1b,Slot:1b,id:"chunkbychunk:worldfragment"}],Map:0,RemainingFuel:30,ScanCharge:34,ScanIterator:{Direction:0,LineLength:1,LineRemaining:1,X:15,Y:15}}
Stacktrace:
at net.minecraft.class_2818$class_5563.method_31703(class_2818.java:659)
at net.minecraft.class_2818$class_5564.method_31703(class_2818.java:713)
at net.minecraft.class_1937.method_18471(class_1937.java:475)
at net.minecraft.class_3218.method_18765(class_3218.java:368)
at net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:907)
at net.minecraft.class_3176.method_3813(class_3176.java:322)
at net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:851)
at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:697)
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:273)
at java.base/java.lang.Thread.run(Thread.java:833)

-- Affected level --
Details:
All players: 0 total; []
Chunk stats: 2209
Level dimension: minecraft:overworld
Level spawn location: World: (8,66,-24), Section: (at 8,2,8 in 0,4,-2; chunk contains blocks 0,-64,-32 to 15,319,-17), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,-64,-512 to 511,319,-1)
Level time: 280169 game time, 280169 day time
Level name: world
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Level weather: Rain time: 101782 (now: false), thunder time: 2558 (now: false)
Known server brands: fabric
Level was modded: true
Level storage version: 0x04ABD - Anvil
Stacktrace:
at net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:907)
at net.minecraft.class_3176.method_3813(class_3176.java:322)
at net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:851)
at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:697)
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:273)
at java.base/java.lang.Thread.run(Thread.java:833)

-- System Details --
Details:
Minecraft Version: 1.18.2
Minecraft Version ID: 1.18.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 17.0.2, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode, sharing), Oracle Corporation
Memory: 2197813248 bytes (2095 MiB) / 5322571776 bytes (5076 MiB) up to 6442450944 bytes (6144 MiB)
CPUs: 6
Processor Vendor: GenuineIntel
Processor Name: Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz
Identifier: Intel64 Family 6 Model 158 Stepping 10
Microarchitecture: Coffee Lake
Frequency (GHz): 2.81
Number of physical packages: 1
Number of physical CPUs: 6
Number of logical CPUs: 6
Graphics card #0 name: NVIDIA GeForce GTX 1050 Ti
Graphics card #0 vendor: NVIDIA (0x10de)
Graphics card #0 VRAM (MB): 4095.00
Graphics card #0 deviceId: 0x1c82
Graphics card #0 versionInfo: DriverVersion=27.21.14.6589
Memory slot #0 capacity (MB): 8192.00
Memory slot #0 clockSpeed (GHz): 2.13
Memory slot #0 type: DDR4
Memory slot #1 capacity (MB): 8192.00
Memory slot #1 clockSpeed (GHz): 2.13
Memory slot #1 type: DDR4
Virtual memory max (MB): 22985.48
Virtual memory used (MB): 17626.65
Swap memory total (MB): 6656.00
Swap memory used (MB): 516.78
JVM Flags: 1 total; -Xmx6G
Fabric Mods:
alternate-current: Alternate Current 1.4.0
architectury: Architectury 4.5.76
bclib: BCLib 1.4.7
betterthanmending: BetterThanMending 1.3.0
chunkbychunk: Chunk By Chunk 1.8.1+1.18.2
connected-doors: Connected Doors 1.1+1.18
consistency_plus: Consistency Plus 0.5.0+1.18.2
stonecutter_recipe_tags: Stonecutter Recipe Tags 3.0.1+1.18.bc850d5.fabric
cosmetic-armor: Cosmetic Armor 1.3.1
cpm: Customizable Player Models 0.4.3a
eer: Erroring Entity Remover 1.0.2+1.18
enchantmentcompat: Enchantment Compatibility 1.0.0
roundalib: RoundaLib 0.1.8
enderscape: Enderscape 0.3.3-1.18.2
expanded_axe_enchanting: Expanded Axe Enchanting 1.0.3
expanded_trident_enchanting: Expanded Trident Enchanting 1.0.3
fabric: Fabric API 0.57.0+1.18.2
fabric-api-base: Fabric API Base 0.4.4+d7c144a860
fabric-api-lookup-api-v1: Fabric API Lookup API (v1) 1.6.2+2373a54560
fabric-biome-api-v1: Fabric Biome API (v1) 8.0.6+651bcc5960
fabric-command-api-v1: Fabric Command API (v1) 1.1.9+d7c144a860
fabric-commands-v0: Fabric Commands (v0) 0.2.8+b4f4f6cd60
fabric-containers-v0: Fabric Containers (v0) 0.1.22+d7c144a860
fabric-content-registries-v0: Fabric Content Registries (v0) 3.1.1+c85f2e3860
fabric-convention-tags-v1: Fabric Convention Tags 1.0.1+474e4f7960
fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.2.1+ee261a3e60
fabric-data-generation-api-v1: Fabric Data Generation API (v1) 3.0.0+9fcb91d260
fabric-dimensions-v1: Fabric Dimensions API (v1) 2.1.20+489d6f8260
fabric-entity-events-v1: Fabric Entity Events (v1) 1.4.8+d7c144a860
fabric-events-interaction-v0: Fabric Events Interaction (v0) 0.4.19+d7c144a860
fabric-events-lifecycle-v0: Fabric Events Lifecycle (v0) 0.2.18+d7c144a860
fabric-game-rule-api-v1: Fabric Game Rule API (v1) 1.0.13+d7c144a860
fabric-item-api-v1: Fabric Item API (v1) 1.5.1+6c4e5d0960
fabric-item-groups-v0: Fabric Item Groups (v0) 0.3.14+91896a4960
fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 2.1.0+cc71601c60
fabric-loot-api-v2: Fabric Loot API (v2) 1.1.0+1997ad1260
fabric-loot-tables-v1: Fabric Loot Tables (v1) 1.1.2+e747827960
fabric-mining-level-api-v1: Fabric Mining Level API (v1) 2.1.4+cc71601c60
fabric-networking-api-v1: Fabric Networking API (v1) 1.0.22+e6b169eb60
fabric-networking-v0: Fabric Networking (v0) 0.3.9+b4f4f6cd60
fabric-object-builder-api-v1: Fabric Object Builder API (v1) 2.1.3+032c981d60
fabric-particles-v1: Fabric Particles (v1) 0.2.12+526dc1ac60
fabric-registry-sync-v0: Fabric Registry Sync (v0) 0.9.9+0d9ab37260
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.3.7+d7c144a860
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 2.0.2+54e5b2ec60
fabric-resource-conditions-api-v1: Fabric Resource Conditions API (v1) 2.0.3+91b7aa6660
fabric-resource-loader-v0: Fabric Resource Loader (v0) 0.5.2+446e059560
fabric-screen-handler-api-v1: Fabric Screen Handler API (v1) 1.2.1+1f6558e860
fabric-transfer-api-v1: Fabric Transfer API (v1) 1.6.3+f4563ac860
fabric-transitive-access-wideners-v1: Fabric Transitive Access Wideners (v1) 1.1.0+e747827960
fabric-language-kotlin: Fabric Language Kotlin 1.7.3+kotlin.1.6.20
org_jetbrains_kotlin_kotlin-reflect: kotlin-reflect 1.6.20
org_jetbrains_kotlin_kotlin-stdlib: kotlin-stdlib 1.6.20
org_jetbrains_kotlin_kotlin-stdlib-jdk7: kotlin-stdlib-jdk7 1.6.20
org_jetbrains_kotlin_kotlin-stdlib-jdk8: kotlin-stdlib-jdk8 1.6.20
org_jetbrains_kotlinx_kotlinx-coroutines-core-jvm: kotlinx-coroutines-core-jvm 1.6.1
org_jetbrains_kotlinx_kotlinx-coroutines-jdk8: kotlinx-coroutines-jdk8 1.6.1
org_jetbrains_kotlinx_kotlinx-serialization-cbor-jvm: kotlinx-serialization-cbor-jvm 1.3.2
org_jetbrains_kotlinx_kotlinx-serialization-core-jvm: kotlinx-serialization-core-jvm 1.3.2
org_jetbrains_kotlinx_kotlinx-serialization-json-jvm: kotlinx-serialization-json-jvm 1.3.2
fabricloader: Fabric Loader 0.14.8
horsebuff: HorseBuff 2.0.1
cloth-config: Cloth Config v6 6.2.62
cloth-basic-math: cloth-basic-math 0.6.1
java: Java HotSpot(TM) 64-Bit Server VM 17
lithium: Lithium 0.7.10
mcxr-core: [MCXR] Core 0.2.1
com_electronwill_night-config_core: core 3.6.5
com_electronwill_night-config_toml: toml 3.6.5
org_joml_joml: joml 1.10.4
memoryleakfix: memory Leak Fix 1.18.2-0.3.5
minecraft: Minecraft 1.18.2
notenoughcrashes: Not Enough Crashes 4.1.6+1.18.2
origins: Origins 1.4.1
apoli: Apoli 2.3.3
additionalentityattributes: Additionalentityattributes 1.0.0+1.18.2
calio: Calio 1.5.1
cardinal-components-base: Cardinal Components API (base) 4.1.4
cardinal-components-entity: Cardinal Components API (entities) 4.1.4
playerabilitylib: Pal 1.5.0
reach-entity-attributes: Reach Entity Attributes 2.1.1
pehkui: Pehkui 3.3.3+1.14.4-1.19.1
kanos_config: Kanos Config 0.3.1+1.14.4-1.19
purpeille: Purpeille 2.3.2+fabric-1.18.2
cmods: Combined Modifiers 1.2.0
voidcrafting: Void Crafting 1.6.4+fabric-1.18.2
roughlyenoughitems: Roughly Enough Items 8.3.510
roughlyenoughresources: Roughly Enough Resources 2.5.0
sky: Sky Origin 0.2.4
starlight: Starlight 1.0.2+fabric.89b8d9f
taxfreelevels: Tax Free Levels 1.3
the_beginning: The Beginning 1.0.0
toolleveling: ToolLeveling+ 1.18.2 - 1.3.3
trinkets: Trinkets 3.3.1
waystones: Waystones 2.5.5+mc1.18.2
xaerominimap: Xaero's Minimap 22.11.1
xaeroworldmap: Xaero's World Map 1.25.1
Server Running: true
Player Count: 0 / 10; []
Data Packs: vanilla, Fabric Mods
World Generation: Experimental
Is Modded: Definitely; Server brand changed to 'fabric'
Type: Dedicated Server (map_server.txt)
Suspected Mods: Chunk By Chunk (chunkbychunk)

It also works completely fine in Singleplayer! Just figured I'd add that as I forgot to mention that!

I did some investigation. The issue seems to have been caused by a newer version of Fabric Loader and/or Fabric API that changed how Fabric handles additional dimensions - the generation dimension isn't loading any more so the scanner fails to find it (and presumably new chunks would fail to spawn with the chunk spawner). Unfortunately it looks like changing the version of Fabric back won't fix the issue because the world will have lost the generation dimension configuration.

I'll backport the fix I made for 1.19.0 for the same issue to 1.18.2 on the weekend (I didn't realise the issue was in versions of fabric prior to those for 1.19.0, sorry), which should fix the problem - this regenerates the generation dimension configuration every launch.

Its OK! Thanks for taking the time to figure out what's happening! 👍

Fixed in 1.8.3 for fabric + 1.18.2