Game Crash Bug From Loading a Slime Entity Forge 1.15.2 - 31.1.0

[JAR143983]

While playing Forge 1.15.2 - 31.1.0 I encountered a game crashing bug whenever I switched from peaceful mode to a game mode with hostile mods.  I got an error message stating: "

The game crashed whilst rendering entity in world
Error: java.lang.NoSuchMethodError: net.minecraft.client.renderer.entity.IEntityRenderer.func_110775_a(Lnet/minecraft/entity/Entity;)Lnet/minecraft/util/ResourceLocation;

"

I followed this to the crash report (Text at the end of this post) and was unable to understand the problem.  So, I made an empty creative world and began spawning in different hostile mobs to test and see what was causing the crashing error.  I discovered that it was the SLIME mob that caused the game crashing error.  I do not know if this is exclusive to certain sizes of slime or to all of them.  I am running no other mods aside from FORGE its self.  I would like to thank the good people at Forge for their work and help in resolving this bug.  Thank you for your time and attention.  

 
The Crash Report is a follows: 

 

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 2/29/20 9:23 PM
Description: Rendering entity in world

java.lang.NoSuchMethodError: net.minecraft.client.renderer.entity.IEntityRenderer.func_110775_a(Lnet/minecraft/entity/Entity;)Lnet/minecraft/util/ResourceLocation;
    at net.minecraft.client.renderer.entity.layers.LayerRenderer.func_229139_a_(SourceFile:40) ~[?:?] {re:classloading}
    at net.minecraft.client.renderer.entity.layers.SlimeGelLayer.func_225628_a_(SourceFile:29) ~[?:?] {re:classloading}
    at net.minecraft.client.renderer.entity.layers.SlimeGelLayer.func_225628_a_(SourceFile:13) ~[?:?] {re:classloading}
    at net.minecraft.client.renderer.entity.LivingRenderer.func_225623_a_(LivingRenderer.java:123) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.entity.MobRenderer.func_225623_a_(SourceFile:43) ~[?:?] {re:classloading,xf:OptiFine:default}
    at net.minecraft.client.renderer.entity.SlimeRenderer.func_225623_a_(SourceFile:23) ~[?:?] {re:classloading}
    at net.minecraft.client.renderer.entity.SlimeRenderer.func_225623_a_(SourceFile:11) ~[?:?] {re:classloading}
    at net.minecraft.client.renderer.entity.EntityRendererManager.func_229084_a_(EntityRendererManager.java:245) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.WorldRenderer.func_228418_a_(WorldRenderer.java:1094) ~[?:?] {re:classloading,xf:OptiFine:default,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.WorldRenderer.func_228426_a_(WorldRenderer.java:948) ~[?:?] {re:classloading,xf:OptiFine:default,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.GameRenderer.func_228378_a_(GameRenderer.java:600) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.GameRenderer.func_195458_a(GameRenderer.java:422) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:925) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:554) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.main.Main.main(SourceFile:204) [?:?] {re:classloading}
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51] {}
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51] {}
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] {}
    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:56) [forge-1.15.2-31.1.0.jar:31.1] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$397/102103410.call(Unknown Source) [forge-1.15.2-31.1.0.jar:31.1] {}
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-5.0.0-milestone.4.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.layers.LayerRenderer.func_229139_a_(SourceFile:40)
    at net.minecraft.client.renderer.entity.layers.SlimeGelLayer.func_225628_a_(SourceFile:29)
    at net.minecraft.client.renderer.entity.layers.SlimeGelLayer.func_225628_a_(SourceFile:13)
    at net.minecraft.client.renderer.entity.LivingRenderer.func_225623_a_(LivingRenderer.java:123)
    at net.minecraft.client.renderer.entity.MobRenderer.func_225623_a_(SourceFile:43)
    at net.minecraft.client.renderer.entity.SlimeRenderer.func_225623_a_(SourceFile:23)
    at net.minecraft.client.renderer.entity.SlimeRenderer.func_225623_a_(SourceFile:11)

-- Entity being rendered --
Details:
    Entity Type: minecraft:slime (net.minecraft.entity.monster.SlimeEntity)
    Entity ID: 9
    Entity Name: Slime
    Entity's Exact location: -3.12, 64.00, 7.10
    Entity's Block location: World: (-4,64,7), Chunk: (at 12,4,7 in -1,0; contains blocks -16,0,0 to -1,255,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
    Entity's Momentum: 0.00, -0.07, 0.00
    Entity's Passengers: []
    Entity's Vehicle: ~~ERROR~~ NullPointerException: null

-- Renderer details --
Details:
    Assigned renderer: net.minecraft.client.renderer.entity.SlimeRenderer@62672ad5
    Location: 5.45,-3.36,-1.77 - World: (5,-4,-2), Chunk: (at 5,-1,14 in 0,-1; contains blocks 0,0,-16 to 15,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
    Rotation: 75.9375
    Delta: 0.33999825
Stacktrace:
    at net.minecraft.client.renderer.entity.EntityRendererManager.func_229084_a_(EntityRendererManager.java:245)
    at net.minecraft.client.renderer.WorldRenderer.func_228418_a_(WorldRenderer.java:1094)
    at net.minecraft.client.renderer.WorldRenderer.func_228426_a_(WorldRenderer.java:948)
    at net.minecraft.client.renderer.GameRenderer.func_228378_a_(GameRenderer.java:600)

-- Affected level --
Details:
    All players: 1 total; [ClientPlayerEntity['AnnoyedUser'/125, l='MpServer', x=-8.57, y=65.74, z=8.87]]
    Chunk stats: Client Chunk Cache: 2809, 579
    Level dimension: DimensionType{minecraft:overworld}
    Level name: MpServer
    Level seed: -8200043178655145922
    Level generator: ID 01 - flat, ver 0. Features enabled: false
    Level generator options: {}
    Level spawn location: World: (0,64,0), Chunk: (at 0,4,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
    Level time: 3498 game time, 3498 day time
    Known server brands: 
    Level was modded: false
    Level storage version: 0x00000 - Unknown?
    Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
    Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
    Server brand: forge
    Server type: Integrated singleplayer server
Stacktrace:
    at net.minecraft.client.world.ClientWorld.func_72914_a(ClientWorld.java:442)
    at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:1764)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:568)
    at net.minecraft.client.main.Main.main(SourceFile:204)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:56)
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$397/102103410.call(Unknown Source)
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:81)
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:65)

-- System Details --
Details:
    Minecraft Version: 1.15.2
    Minecraft Version ID: 1.15.2
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_51, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 869384424 bytes (829 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB)
    CPUs: 12
    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
    ModLauncher: 5.0.0-milestone.4+67+b1a340b
    ModLauncher launch target: fmlclient
    ModLauncher naming: srg
    ModLauncher services: 
        /eventbus-2.0.0-milestone.1-service.jar eventbus PLUGINSERVICE 
        /forge-1.15.2-31.1.0.jar object_holder_definalize PLUGINSERVICE 
        /forge-1.15.2-31.1.0.jar runtime_enum_extender PLUGINSERVICE 
        /accesstransformers-2.0.0-milestone.1-shadowed.jar accesstransformer PLUGINSERVICE 
        /forge-1.15.2-31.1.0.jar capability_inject_definalize PLUGINSERVICE 
        /forge-1.15.2-31.1.0.jar runtimedistcleaner PLUGINSERVICE 
        /OptiFine_1.14.4_HD_U_F4.jar OptiFine TRANSFORMATIONSERVICE 
        /forge-1.15.2-31.1.0.jar fml TRANSFORMATIONSERVICE 
    FML: 31.1
    Forge: net.minecraftforge:31.1.0
    FML Language Providers: 
        javafml@31.1
        minecraft@1
    Mod List: 
        forge-1.15.2-31.1.0-client.jar Minecraft {minecraft@1.15.2 DONE}
        forge-1.15.2-31.1.0-universal.jar Forge {forge@31.1.0 DONE}
    Launched Version: 1.15.2-forge-31.1.0
    Backend library: LWJGL version 3.2.2 build 10
    Backend API: AMD Radeon HD 6800 Series GL version 4.5.13399 Compatibility Profile Context 15.201.1151.1008, ATI Technologies Inc.
    GL Caps: Using framebuffer using OpenGL 3.0
    Using VBOs: Yes
    Is Modded: Definitely; Client brand changed to 'forge'
    Type: Client (map_client.txt)
    Resource Packs: vanilla
    Current Language: English (US)
    CPU: 12x Intel(R) Core(TM) i7 CPU X 990 @ 3.47GHz

[DaemonUmbra]

You're trying to run 1.14.4 Optifine in 1.15.2, this isn't going to work.

[JAR143983]

Thank you very much!  This was very helpful is resolving the issue, I had no idea I had to clean my mods folder between updates.