I hate posting these small problems I have here asking for help, but I legit cannot find resources that tell me how to properly do these things. If someone can lend me a link detailing a lot of the minecraft modding classes and such, much appreciated. 

My mob crashes the game when I spawn it. 

My question about this is, What's the problem here? Thanks in advance.

GitHub Repository: https://github.com/Coldthunder4/AGuardMod 

Crash Log:

---- Minecraft Crash Report ---- // I let you down. Sorry Time: 1/6/23, 9:53 PM Description: Unexpected error java.lang.ClassCastException: class net.coldthunder4.cellguard.entity.custom.GuardEntity cannot be cast to class net.minecraft.world.entity.Mob (net.coldthunder4.cellguard.entity.custom.GuardEntity is in module [email protected] of loader 'TRANSFORMER' @7c8c70d6; net.minecraft.world.entity.Mob is in module [email protected] of loader 'TRANSFORMER' @7c8c70d6) at net.minecraft.client.renderer.entity.MobRenderer.shouldRender(MobRenderer.java:20) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.entity.EntityRenderDispatcher.shouldRender(EntityRenderDispatcher.java:123) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.LevelRenderer.renderLevel(LevelRenderer.java:1194) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.GameRenderer.renderLevel(GameRenderer.java:1068) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.GameRenderer.render(GameRenderer.java:840) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.runTick(Minecraft.java:1084) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.run(Minecraft.java:669) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.main.Main.main(Main.java:206) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:runtimedistcleaner:A} at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {} at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {} at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {} at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] {} at net.minecraftforge.fml.loading.targets.ForgeClientUserdevLaunchHandler.lambda$launchService$0(ForgeClientUserdevLaunchHandler.java:25) ~[fmlloader-1.19-41.1.0.jar%2394!/:?] {} at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) [bootstraplauncher-1.1.2.jar:?] {} A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- Head -- Thread: Render thread Stacktrace: at net.minecraft.client.renderer.entity.MobRenderer.shouldRender(MobRenderer.java:20) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.entity.EntityRenderDispatcher.shouldRender(EntityRenderDispatcher.java:123) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.LevelRenderer.renderLevel(LevelRenderer.java:1194) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.GameRenderer.renderLevel(GameRenderer.java:1068) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} -- Affected level -- Details: All players: 1 total; [LocalPlayer['Dev'/82, l='ClientLevel', x=-8.50, y=-60.00, z=7.50]] Chunk stats: 961, 609 Level dimension: minecraft:overworld Level spawn location: World: (0,-60,0), Section: (at 0,4,0 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) Level time: 450 game time, 450 day time Server brand: forge Server type: Integrated singleplayer server Stacktrace: at net.minecraft.client.multiplayer.ClientLevel.fillReportDetails(ClientLevel.java:449) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.fillReport(Minecraft.java:2237) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.run(Minecraft.java:691) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.main.Main.main(Main.java:206) ~[forge-1.19-41.1.0_mapped_official_1.19-recomp.jar%23181!/:?] {re:classloading,pl:runtimedistcleaner:A} at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {} at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {} at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {} at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] {} at net.minecraftforge.fml.loading.targets.ForgeClientUserdevLaunchHandler.lambda$launchService$0(ForgeClientUserdevLaunchHandler.java:25) ~[fmlloader-1.19-41.1.0.jar%2394!/:?] {} at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-10.0.8.jar%23106!/:?] {} at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) [bootstraplauncher-1.1.2.jar:?] {} -- Last reload -- Details: Reload number: 1 Reload reason: initial Finished: Yes Packs: Default, Mod Resources -- System Details -- Details: Minecraft Version: 1.19 Minecraft Version ID: 1.19 Operating System: Windows 10 (amd64) version 10.0 Java Version: 17.0.5, Eclipse Adoptium Java VM Version: OpenJDK 64-Bit Server VM (mixed mode, sharing), Eclipse Adoptium Memory: 1134633312 bytes (1082 MiB) / 1654652928 bytes (1578 MiB) up to 4217372672 bytes (4022 MiB) CPUs: 12 Processor Vendor: GenuineIntel Processor Name: 11th Gen Intel(R) Core(TM) i5-11400H @ 2.70GHz Identifier: Intel64 Family 6 Model 141 Stepping 1 Microarchitecture: unknown Frequency (GHz): 2.69 Number of physical packages: 1 Number of physical CPUs: 6 Number of logical CPUs: 12 Graphics card #0 name: Intel(R) UHD Graphics Graphics card #0 vendor: Intel Corporation (0x8086) Graphics card #0 VRAM (MB): 1024.00 Graphics card #0 deviceId: 0x9a68 Graphics card #0 versionInfo: DriverVersion=31.0.101.1999 Graphics card #1 name: NVIDIA GeForce RTX 3050 Ti Laptop GPU Graphics card #1 vendor: NVIDIA (0x10de) Graphics card #1 VRAM (MB): 4095.00 Graphics card #1 deviceId: 0x25a0 Graphics card #1 versionInfo: DriverVersion=30.0.15.1165 Memory slot #0 capacity (MB): 8192.00 Memory slot #0 clockSpeed (GHz): 3.20 Memory slot #0 type: DDR4 Memory slot #1 capacity (MB): 8192.00 Memory slot #1 clockSpeed (GHz): 3.20 Memory slot #1 type: DDR4 Virtual memory max (MB): 26837.67 Virtual memory used (MB): 18781.58 Swap memory total (MB): 10752.00 Swap memory used (MB): 846.11 JVM Flags: 1 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump Launched Version: MOD_DEV Backend library: LWJGL version 3.3.1 build 7 Backend API: NVIDIA GeForce RTX 3050 Ti Laptop GPU/PCIe/SSE2 GL version 3.2.0 NVIDIA 511.65, NVIDIA Corporation Window size: 1920x991 GL Caps: Using framebuffer using OpenGL 3.2 GL debug messages: Using VBOs: Yes Is Modded: Definitely; Client brand changed to 'forge'; Server brand changed to 'forge' Type: Integrated Server (map_client.txt) Graphics mode: fancy Resource Packs: Current Language: English (US) CPU: 12x 11th Gen Intel(R) Core(TM) i5-11400H @ 2.70GHz Server Running: true Player Count: 1 / 8; [ServerPlayer['Dev'/82, l='ServerLevel[FLAT]', x=-8.50, y=-60.00, z=7.50]] Data Packs: vanilla, mod:forge, mod:cellguard World Generation: Stable ModLauncher: 10.0.8+10.0.8+main.0ef7e830 ModLauncher launch target: forgeclientuserdev ModLauncher naming: mcp ModLauncher services: mixin-0.8.5.jar mixin PLUGINSERVICE eventbus-6.0.0.jar eventbus PLUGINSERVICE fmlloader-1.19-41.1.0.jar slf4jfixer PLUGINSERVICE fmlloader-1.19-41.1.0.jar object_holder_definalize PLUGINSERVICE fmlloader-1.19-41.1.0.jar runtime_enum_extender PLUGINSERVICE fmlloader-1.19-41.1.0.jar capability_token_subclass PLUGINSERVICE accesstransformers-8.0.4.jar accesstransformer PLUGINSERVICE fmlloader-1.19-41.1.0.jar runtimedistcleaner PLUGINSERVICE modlauncher-10.0.8.jar mixin TRANSFORMATIONSERVICE modlauncher-10.0.8.jar fml TRANSFORMATIONSERVICE FML Language Providers: [email protected] lowcodefml@null javafml@null Mod List: forge-1.19-41.1.0_mapped_official_1.19-recomp.jar |Minecraft |minecraft |1.19 |DONE |Manifest: a1:d4:5e:04:4f:d3:d6:e0:7b:37:97:cf:77:b0:de:ad:4a:47:ce:8c:96:49:5f:0a:cf:8c:ae:b2:6d:4b:8a:3f |Forge |forge |41.1.0 |DONE |Manifest: NOSIGNATURE main |Guard Mod |cellguard |0.0.1-1.19 |DONE |Manifest: NOSIGNATURE Crash Report UUID: c698254a-08c5-4591-af27-e4a1ad642f47 FML: 41.1 Forge: net.minecraftforge:41.1.0

I think you meant to extend a class further down than LivingEntity (probably at least Mob?), there's a lot of classes in the inheritance line between LivingEntity and most vanilla mobs.

Eg. a zombie:

LivingEntity -> Mob -> PathfinderMob -> Monster -> Zombie

Does LivingEntity not work?

It works. now it's a steve model though, gotta change to the skin i added but i'll figure that out. Thank you Legendary, I really appreciate it