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When downloading the texturepack modelengine created, every users on 1.21.4 will get kicked with this client log error. After reporting the issue to itemsadder here is what he said:

https://github.com/PluginBugs/Issues-ItemsAdder/issues/4242

I can confirm that removing the modelengine part from my pack is fixing the issue.

Here is the client side crash log:

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 2024-12-12 20:49:11
Description: Rendering entity in world

java.lang.ArrayIndexOutOfBoundsException: Index -2 out of bounds for length 0
	at net.minecraft.client.renderer.entity.ItemRenderer.getLayerColorSafe(SourceFile:124)
	at net.minecraft.client.renderer.entity.ItemRenderer.renderQuadList(SourceFile:137)
	at net.minecraft.client.renderer.entity.ItemRenderer.renderModelLists(SourceFile:65)
	at net.minecraft.client.renderer.entity.ItemRenderer.renderItem(SourceFile:83)
	at net.minecraft.client.renderer.item.ItemStackRenderState$LayerRenderState.render(SourceFile:170)
	at net.minecraft.client.renderer.item.ItemStackRenderState.render(SourceFile:94)
	at net.minecraft.client.renderer.entity.DisplayRenderer$ItemDisplayRenderer.renderInner(SourceFile:207)
	at net.minecraft.client.renderer.entity.DisplayRenderer$ItemDisplayRenderer.extractRenderState(SourceFile:176)
	at net.minecraft.client.renderer.entity.DisplayRenderer.render(SourceFile:105)
	at net.minecraft.client.renderer.entity.DisplayRenderer$ItemDisplayRenderer.extractRenderState(SourceFile:176)
	at net.minecraft.client.renderer.entity.EntityRenderDispatcher.render(SourceFile:162)
	at net.minecraft.client.renderer.entity.EntityRenderDispatcher.render(SourceFile:149)
	at net.minecraft.client.renderer.LevelRenderer.renderEntity(SourceFile:987)
	at net.minecraft.client.renderer.LevelRenderer.renderEntities(SourceFile:864)
	at net.minecraft.client.renderer.LevelRenderer.addMainPass(SourceFile:642)
	at com.mojang.blaze3d.framegraph.FrameGraphBuilder.execute(SourceFile:67)
	at net.minecraft.client.renderer.LevelRenderer.renderLevel(SourceFile:552)
	at net.minecraft.client.renderer.GameRenderer.renderLevel(SourceFile:733)
	at net.minecraft.client.renderer.GameRenderer.render(SourceFile:493)
	at net.minecraft.client.Minecraft.runTick(SourceFile:1341)
	at net.minecraft.client.Minecraft.run(SourceFile:922)
	at net.minecraft.client.main.Main.main(SourceFile:267)


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

-- Head --
Thread: Render thread
Stacktrace:
	at net.minecraft.client.renderer.entity.ItemRenderer.getLayerColorSafe(SourceFile:124)
	at net.minecraft.client.renderer.entity.ItemRenderer.renderQuadList(SourceFile:137)
	at net.minecraft.client.renderer.entity.ItemRenderer.renderModelLists(SourceFile:65)
	at net.minecraft.client.renderer.entity.ItemRenderer.renderItem(SourceFile:83)
	at net.minecraft.client.renderer.item.ItemStackRenderState$LayerRenderState.render(SourceFile:170)
	at net.minecraft.client.renderer.item.ItemStackRenderState.render(SourceFile:94)
	at net.minecraft.client.renderer.entity.DisplayRenderer$ItemDisplayRenderer.renderInner(SourceFile:207)
	at net.minecraft.client.renderer.entity.DisplayRenderer$ItemDisplayRenderer.extractRenderState(SourceFile:176)
	at net.minecraft.client.renderer.entity.DisplayRenderer.render(SourceFile:105)
	at net.minecraft.client.renderer.entity.DisplayRenderer$ItemDisplayRenderer.extractRenderState(SourceFile:176)
	at net.minecraft.client.renderer.entity.EntityRenderDispatcher.render(SourceFile:162)
	at net.minecraft.client.renderer.entity.EntityRenderDispatcher.render(SourceFile:149)
	at net.minecraft.client.renderer.LevelRenderer.renderEntity(SourceFile:987)
	at net.minecraft.client.renderer.LevelRenderer.renderEntities(SourceFile:864)
	at net.minecraft.client.renderer.LevelRenderer.addMainPass(SourceFile:642)
	at com.mojang.blaze3d.framegraph.FrameGraphBuilder.execute(SourceFile:67)
	at net.minecraft.client.renderer.LevelRenderer.renderLevel(SourceFile:552)
	at net.minecraft.client.renderer.GameRenderer.renderLevel(SourceFile:733)

-- Entity being rendered --
Details:
	Entity Type: minecraft:item_display (buk.g)
	Entity ID: 8845
	Entity Name: Item Display
	Entity's Exact location: 9.50, 64.44, 1.50
	Entity's Block location: World: (9,64,1), Section: (at 9,0,1 in 0,4,0; chunk contains blocks 0,-64,0 to 15,319,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,-64,0 to 511,319,511)
	Entity's Momentum: 0.00, 0.00, 0.00
	Entity's Passengers: []
	Entity's Vehicle: buf['Area Effect Cloud'/8844, l='ClientLevel', x=9.50, y=63.94, z=1.50]
Stacktrace:
	at net.minecraft.client.renderer.entity.EntityRenderDispatcher.render(SourceFile:162)
	at net.minecraft.client.renderer.entity.EntityRenderDispatcher.render(SourceFile:149)
	at net.minecraft.client.renderer.LevelRenderer.renderEntity(SourceFile:987)
	at net.minecraft.client.renderer.LevelRenderer.renderEntities(SourceFile:864)
	at net.minecraft.client.renderer.LevelRenderer.addMainPass(SourceFile:642)
	at com.mojang.blaze3d.framegraph.FrameGraphBuilder.execute(SourceFile:67)
	at net.minecraft.client.renderer.LevelRenderer.renderLevel(SourceFile:552)
	at net.minecraft.client.renderer.GameRenderer.renderLevel(SourceFile:733)
	at net.minecraft.client.renderer.GameRenderer.render(SourceFile:493)
	at net.minecraft.client.Minecraft.runTick(SourceFile:1341)
	at net.minecraft.client.Minecraft.run(SourceFile:922)
	at net.minecraft.client.main.Main.main(SourceFile:267)

-- Renderer details --
Details:
	Assigned renderer: grt$b@2c409522
	Location: 9.00,-0.59,1.06 - World: (8,-1,1), Section: (at 8,15,1 in 0,-1,0; chunk contains blocks 0,-64,0 to 15,319,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,-64,0 to 511,319,511)
	Delta: 0.6000013
Stacktrace:
	at net.minecraft.client.renderer.entity.EntityRenderDispatcher.render(SourceFile:162)
	at net.minecraft.client.renderer.entity.EntityRenderDispatcher.render(SourceFile:149)
	at net.minecraft.client.renderer.LevelRenderer.renderEntity(SourceFile:987)
	at net.minecraft.client.renderer.LevelRenderer.renderEntities(SourceFile:864)
	at net.minecraft.client.renderer.LevelRenderer.addMainPass(SourceFile:642)
	at com.mojang.blaze3d.framegraph.FrameGraphBuilder.execute(SourceFile:67)
	at net.minecraft.client.renderer.LevelRenderer.renderLevel(SourceFile:552)
	at net.minecraft.client.renderer.GameRenderer.renderLevel(SourceFile:733)
	at net.minecraft.client.renderer.GameRenderer.render(SourceFile:493)
	at net.minecraft.client.Minecraft.runTick(SourceFile:1341)
	at net.minecraft.client.Minecraft.run(SourceFile:922)
	at net.minecraft.client.main.Main.main(SourceFile:267)

-- Uptime --
Details:
	JVM uptime: 19.684s
	Wall uptime: 15.689s
	High-res time: 15.482s
	Client ticks: 269 ticks / 13.450s
Stacktrace:
	at net.minecraft.client.Minecraft.fillReport(SourceFile:2371)
	at net.minecraft.client.Minecraft.emergencySaveAndCrash(SourceFile:991)
	at net.minecraft.client.Minecraft.run(SourceFile:943)
	at net.minecraft.client.main.Main.main(SourceFile:267)

-- Affected level --
Details:
	All players: 3 total; [gkx['LuluxosTacos'/66716, l='ClientLevel', x=0.50, y=63.41, z=0.44], gky['xdLulux'/8564, l='ClientLevel', x=-0.90, y=79.83, z=-6.52], gky['Auctioneer'/2054, l='ClientLevel', x=-46.50, y=67.00, z=-19.50]]
	Chunk stats: 361, 201
	Level dimension: minecraft:overworld
	Level spawn location: World: (-6,65,-8), Section: (at 10,1,8 in -1,4,-1; chunk contains blocks -16,-64,-16 to -1,319,-1), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,-64,-512 to -1,319,-1)
	Level time: 148408934 game time, 30000 day time
	Server brand: Paper (Velocity)
	Server type: Non-integrated multiplayer server
	Tracked entity count: 594

-- Last reload --
Details:
	Reload number: 2
	Reload reason: manual
	Finished: No
	Packs: vanilla, server/00000000/d69238f2-b7ce-30b0-8262-17cd9490f29d

-- System Details --
Details:
	Minecraft Version: 1.21.4
	Minecraft Version ID: 1.21.4
	Operating System: Windows 11 (amd64) version 10.0
	Java Version: 21.0.3, Microsoft
	Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
	Memory: 460547424 bytes (439 MiB) / 1140850688 bytes (1088 MiB) up to 2147483648 bytes (2048 MiB)
	CPUs: 32
	Processor Vendor: GenuineIntel
	Processor Name: 13th Gen Intel(R) Core(TM) i9-13900KF
	Identifier: Intel64 Family 6 Model 183 Stepping 1
	Microarchitecture: Raptor Lake
	Frequency (GHz): 3.00
	Number of physical packages: 1
	Number of physical CPUs: 24
	Number of logical CPUs: 32
	Graphics card #0 name: Microsoft Basic Display Adapter
	Graphics card #0 vendor: Microsoft
	Graphics card #0 VRAM (MiB): 0.00
	Graphics card #0 deviceId: VideoController1
	Graphics card #0 versionInfo: 10.0.22621.1
	Graphics card #1 name: NVIDIA GeForce RTX 4080
	Graphics card #1 vendor: NVIDIA
	Graphics card #1 VRAM (MiB): 16376.00
	Graphics card #1 deviceId: VideoController2
	Graphics card #1 versionInfo: 32.0.15.6636
	Memory slot #0 capacity (MiB): 32768.00
	Memory slot #0 clockSpeed (GHz): 5.60
	Memory slot #0 type: DDR5
	Memory slot #1 capacity (MiB): 32768.00
	Memory slot #1 clockSpeed (GHz): 5.60
	Memory slot #1 type: DDR5
	Virtual memory max (MiB): 69444.79
	Virtual memory used (MiB): 44741.26
	Swap memory total (MiB): 4096.00
	Swap memory used (MiB): 67.25
	Space in storage for jna.tmpdir (MiB): available: 291515.09, total: 953031.00
	Space in storage for org.lwjgl.system.SharedLibraryExtractPath (MiB): available: 291515.09, total: 953031.00
	Space in storage for io.netty.native.workdir (MiB): available: 291515.09, total: 953031.00
	Space in storage for java.io.tmpdir (MiB): available: 291515.09, total: 953031.00
	Space in storage for workdir (MiB): available: 291515.09, total: 953031.00
	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
	Launched Version: 1.21.4
	Launcher name: minecraft-launcher
	Backend library: LWJGL version 3.3.3+5
	Backend API: NVIDIA GeForce RTX 4080/PCIe/SSE2 GL version 3.2.0 NVIDIA 566.36, NVIDIA Corporation
	Window size: 854x480
	GFLW Platform: win32
	GL Caps: Using framebuffer using OpenGL 3.2
	GL debug messages: 
	Is Modded: Probably not. Client jar signature and brand is untouched
	Universe: 400921fb54442d18
	Type: Client (map_client.txt)
	Graphics mode: fancy
	Render Distance: 6/29 chunks
	Resource Packs: vanilla, server/00000000/d69238f2-b7ce-30b0-8262-17cd9490f29d (incompatible)
	Current Language: en_us
	Locale: fr_FR
	System encoding: Cp1252
	File encoding: UTF-8
	CPU: 32x 13th Gen Intel(R) Core(TM) i9-13900KF