I'm aware this is a beta.  I'm supporting the effort by contributing by helping to test it.

 

Vanilla MC loads fine, but when using Forge, it results in a hard crash every time on attempting to join a world (doesn't matter if it's offline new world, or joining a server, still consistently crashes every time). It crashes with this error:

The game crashed whilst starting integrated server
Error: java.lang.NoSuchMethodError: net.minecraft.util.ResourceLocation.compareNamespaced(Lnet/minecraft/util/ResourceLocation;)I
Exit Code: -1

 

Log is included.  Let me know if I should open a new issue over on Github for Forge.
 

---- Minecraft Crash Report ----
// I let you down. Sorry :(

Time: 11/5/20 11:55 AM
Description: Starting integrated server

java.lang.NoSuchMethodError: net.minecraft.util.ResourceLocation.compareNamespaced(Lnet/minecraft/util/ResourceLocation;)I
    at net.minecraftforge.registries.ForgeRegistry$Snapshot.lambda$static$0(ForgeRegistry.java:844) ~[?:?] {re:classloading}
    at net.minecraftforge.registries.ForgeRegistry$Snapshot$$Lambda$5092/487553999.compare(Unknown Source) ~[?:?] {}
    at java.util.TreeMap.compare(TreeMap.java:1291) ~[?:1.8.0_51] {}
    at java.util.TreeMap.put(TreeMap.java:538) ~[?:1.8.0_51] {}
    at net.minecraftforge.registries.ForgeRegistry.lambda$makeSnapshot$3(ForgeRegistry.java:820) ~[?:?] {re:classloading}
    at net.minecraftforge.registries.ForgeRegistry$$Lambda$5093/219040114.accept(Unknown Source) ~[?:?] {}
    at com.google.common.collect.HashBiMap.forEach(HashBiMap.java:528) ~[guava-21.0.jar:?] {}
    at net.minecraftforge.registries.ForgeRegistry.makeSnapshot(ForgeRegistry.java:820) ~[?:?] {re:classloading}
    at net.minecraftforge.registries.RegistryManager.lambda$takeSnapshot$2(RegistryManager.java:180) ~[?:?] {re:classloading}
    at net.minecraftforge.registries.RegistryManager$$Lambda$5091/451900456.accept(Unknown Source) ~[?:?] {}
    at java.lang.Iterable.forEach(Iterable.java:75) ~[?:1.8.0_51] {}
    at net.minecraftforge.registries.RegistryManager.takeSnapshot(RegistryManager.java:180) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.FMLWorldPersistenceHook.getDataForWriting(FMLWorldPersistenceHook.java:76) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.WorldPersistenceHooks.lambda$handleWorldDataSave$0(WorldPersistenceHooks.java:40) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.WorldPersistenceHooks$$Lambda$5089/881300604.accept(Unknown Source) ~[?:?] {}
    at java.util.ArrayList.forEach(ArrayList.java:1249) ~[?:1.8.0_51] {}
    at net.minecraftforge.fml.WorldPersistenceHooks.handleWorldDataSave(WorldPersistenceHooks.java:40) ~[?:?] {re:classloading}
    at net.minecraft.world.storage.SaveFormat$LevelSave.func_237288_a_(SaveFormat.java:345) ~[?:?] {re:computing_frames,re:classloading}
    at net.minecraft.world.storage.SaveFormat$LevelSave.func_237287_a_(SaveFormat.java:336) ~[?:?] {re:computing_frames,re:classloading}
    at net.minecraft.client.Minecraft.func_238195_a_(Minecraft.java:1735) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.func_238192_a_(Minecraft.java:1685) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.screen.CreateWorldScreen.func_195352_j(CreateWorldScreen.java:260) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.screen.CreateWorldScreen.lambda$init$9(CreateWorldScreen.java:205) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.screen.CreateWorldScreen$$Lambda$4298/1819326403.onPress(Unknown Source) ~[?:?] {}
    at net.minecraft.client.gui.widget.button.Button.func_230930_b_(SourceFile:33) ~[?:?] {re:classloading}
    at net.minecraft.client.gui.widget.button.AbstractButton.func_230982_a_(SourceFile:16) ~[?:?] {re:classloading}
    at net.minecraft.client.gui.widget.Widget.func_231044_a_(Widget.java:136) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.INestedGuiEventHandler.func_231044_a_(SourceFile:27) ~[?:?] {re:classloading}
    at net.minecraft.client.MouseHelper.lambda$mouseButtonCallback$0(MouseHelper.java:87) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper$$Lambda$3944/981865495.run(Unknown Source) ~[?:?] {}
    at net.minecraft.client.gui.screen.Screen.func_231153_a_(Screen.java:427) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper.func_198023_a(MouseHelper.java:85) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper.lambda$null$4(MouseHelper.java:175) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper$$Lambda$3943/1934605027.run(Unknown Source) ~[?:?] {}
    at net.minecraft.util.concurrent.ThreadTaskExecutor.execute(SourceFile:94) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:OptiFine:default}
    at net.minecraft.client.MouseHelper.lambda$registerCallbacks$5(MouseHelper.java:174) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper$$Lambda$3519/1663271865.invoke(Unknown Source) ~[?:?] {}
    at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36) ~[lwjgl-glfw-3.2.2.jar:build 10] {}
    at org.lwjgl.system.JNI.invokeV(Native Method) ~[lwjgl-3.2.2.jar:build 10] {}
    at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174) ~[lwjgl-glfw-3.2.2.jar:build 10] {}
    at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:127) ~[?:?] {re:classloading}
    at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:999) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.main.Main.main(Main.java:184) [?:?] {re:classloading,pl:runtimedistcleaner:A}
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51] {}
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51] {}
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] {}
    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) [forge-1.16.4-35.0.2.jar:35.0] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$424/368153528.call(Unknown Source) [forge-1.16.4-35.0.2.jar:35.0] {}
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.6.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.6.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.6.jar:?] {}
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.6.jar:?] {}
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.6.jar:?] {}


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

-- Head --
Thread: Render thread
Stacktrace:
    at net.minecraftforge.registries.ForgeRegistry$Snapshot.lambda$static$0(ForgeRegistry.java:844) ~[?:?] {re:classloading}
    at net.minecraftforge.registries.ForgeRegistry$Snapshot$$Lambda$5092/487553999.compare(Unknown Source) ~[?:?] {}
    at java.util.TreeMap.compare(TreeMap.java:1291) ~[?:1.8.0_51] {}
    at java.util.TreeMap.put(TreeMap.java:538) ~[?:1.8.0_51] {}
    at net.minecraftforge.registries.ForgeRegistry.lambda$makeSnapshot$3(ForgeRegistry.java:820) ~[?:?] {re:classloading}
    at net.minecraftforge.registries.ForgeRegistry$$Lambda$5093/219040114.accept(Unknown Source) ~[?:?] {}
    at com.google.common.collect.HashBiMap.forEach(HashBiMap.java:528) ~[guava-21.0.jar:?] {}
    at net.minecraftforge.registries.ForgeRegistry.makeSnapshot(ForgeRegistry.java:820) ~[?:?] {re:classloading}
    at net.minecraftforge.registries.RegistryManager.lambda$takeSnapshot$2(RegistryManager.java:180) ~[?:?] {re:classloading}
    at net.minecraftforge.registries.RegistryManager$$Lambda$5091/451900456.accept(Unknown Source) ~[?:?] {}
    at java.lang.Iterable.forEach(Iterable.java:75) ~[?:1.8.0_51] {}
    at net.minecraftforge.registries.RegistryManager.takeSnapshot(RegistryManager.java:180) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.FMLWorldPersistenceHook.getDataForWriting(FMLWorldPersistenceHook.java:76) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.WorldPersistenceHooks.lambda$handleWorldDataSave$0(WorldPersistenceHooks.java:40) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.WorldPersistenceHooks$$Lambda$5089/881300604.accept(Unknown Source) ~[?:?] {}
    at java.util.ArrayList.forEach(ArrayList.java:1249) ~[?:1.8.0_51] {}
    at net.minecraftforge.fml.WorldPersistenceHooks.handleWorldDataSave(WorldPersistenceHooks.java:40) ~[?:?] {re:classloading}
    at net.minecraft.world.storage.SaveFormat$LevelSave.func_237288_a_(SaveFormat.java:345) ~[?:?] {re:computing_frames,re:classloading}
    at net.minecraft.world.storage.SaveFormat$LevelSave.func_237287_a_(SaveFormat.java:336) ~[?:?] {re:computing_frames,re:classloading}
-- Starting integrated server --
Details:
    Level ID: New Worldaa
    Level Name: New Worldaa
Stacktrace:
    at net.minecraft.client.Minecraft.func_238195_a_(Minecraft.java:1735) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.func_238192_a_(Minecraft.java:1685) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.screen.CreateWorldScreen.func_195352_j(CreateWorldScreen.java:260) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.screen.CreateWorldScreen.lambda$init$9(CreateWorldScreen.java:205) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.screen.CreateWorldScreen$$Lambda$4298/1819326403.onPress(Unknown Source) ~[?:?] {}
    at net.minecraft.client.gui.widget.button.Button.func_230930_b_(SourceFile:33) ~[?:?] {re:classloading}
    at net.minecraft.client.gui.widget.button.AbstractButton.func_230982_a_(SourceFile:16) ~[?:?] {re:classloading}
    at net.minecraft.client.gui.widget.Widget.func_231044_a_(Widget.java:136) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.INestedGuiEventHandler.func_231044_a_(SourceFile:27) ~[?:?] {re:classloading}
    at net.minecraft.client.MouseHelper.lambda$mouseButtonCallback$0(MouseHelper.java:87) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper$$Lambda$3944/981865495.run(Unknown Source) ~[?:?] {}


-- Affected screen --
Details:
    Screen name: net.minecraft.client.gui.screen.CreateWorldScreen
Stacktrace:
    at net.minecraft.client.gui.screen.Screen.func_231153_a_(Screen.java:427) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper.func_198023_a(MouseHelper.java:85) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper.lambda$null$4(MouseHelper.java:175) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper$$Lambda$3943/1934605027.run(Unknown Source) ~[?:?] {}
    at net.minecraft.util.concurrent.ThreadTaskExecutor.execute(SourceFile:94) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:OptiFine:default}
    at net.minecraft.client.MouseHelper.lambda$registerCallbacks$5(MouseHelper.java:174) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MouseHelper$$Lambda$3519/1663271865.invoke(Unknown Source) ~[?:?] {}
    at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36) ~[lwjgl-glfw-3.2.2.jar:build 10] {}
    at org.lwjgl.system.JNI.invokeV(Native Method) ~[lwjgl-3.2.2.jar:build 10] {}
    at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174) ~[lwjgl-glfw-3.2.2.jar:build 10] {}
    at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:127) ~[?:?] {re:classloading}
    at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:999) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.main.Main.main(Main.java:184) [?:?] {re:classloading,pl:runtimedistcleaner:A}
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51] {}
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51] {}
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] {}
    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) [forge-1.16.4-35.0.2.jar:35.0] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$424/368153528.call(Unknown Source) [forge-1.16.4-35.0.2.jar:35.0] {}
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.6.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.6.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.6.jar:?] {}
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.6.jar:?] {}
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.6.jar:?] {}


-- System Details --
Details:
    Minecraft Version: 1.16.4
    Minecraft Version ID: 1.16.4
    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: 2360861112 bytes (2251 MB) / 3657433088 bytes (3488 MB) up to 4294967296 bytes (4096 MB)
    CPUs: 12
    JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx4G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
    ModLauncher: 8.0.6+85+master.325de55
    ModLauncher launch target: fmlclient
    ModLauncher naming: srg
    ModLauncher services:
        /mixin-0.8.2.jar mixin PLUGINSERVICE
        /eventbus-3.0.3-service.jar eventbus PLUGINSERVICE
        /forge-1.16.4-35.0.2.jar object_holder_definalize PLUGINSERVICE
        /forge-1.16.4-35.0.2.jar runtime_enum_extender PLUGINSERVICE
        /accesstransformers-2.2.0-shadowed.jar accesstransformer PLUGINSERVICE
        /forge-1.16.4-35.0.2.jar capability_inject_definalize PLUGINSERVICE
        /forge-1.16.4-35.0.2.jar runtimedistcleaner PLUGINSERVICE
        /mixin-0.8.2.jar mixin TRANSFORMATIONSERVICE
        /OptiFine_1.16.3_HD_U_G3.jar OptiFine TRANSFORMATIONSERVICE
        /forge-1.16.4-35.0.2.jar fml TRANSFORMATIONSERVICE
    FML: 35.0
    Forge: net.minecraftforge:35.0.2
    FML Language Providers:
        [email protected]
        minecraft@1
    Mod List:
        forge-1.16.4-35.0.2-client.jar                    |Minecraft                     |minecraft                     |1.16.4              |DONE      |NOSIGNATURE
        forgemod_VoxelMap-1.10.11_for_1.16.3.jar          |VoxelMap                      |voxelmap                      |1.10.11             |DONE      |NOSIGNATURE
        forge-1.16.4-35.0.2-universal.jar                 |Forge                         |forge                         |35.0.2              |DONE      |22:af:21:d8:19:82:7f:93:94:fe:2b:ac:b7:e4:41:57:68:39:87:b1:a7:5c:c6:44:f9:25:74:21:14:f5:0d:90
    Crash Report UUID: 19e26f5d-ef8e-47e6-bf3d-853a31325690
    Launched Version: 1.16.4-forge-35.0.2
    Backend library: LWJGL version 3.2.2 build 10
    Backend API: GeForce RTX 2070/PCIe/SSE2 GL version 4.6.0 NVIDIA 451.67, NVIDIA Corporation
    GL Caps: Using framebuffer using OpenGL 3.0
    Using VBOs: Yes
    Is Modded: Definitely; Client brand changed to 'forge'
    Type: Client (map_client.txt)
    Graphics mode: fancy
    Resource Packs: vanilla, file/ChromaHills-128x-1.16-v1.zip, file/VanillaTweaks_r691292.zip (incompatible), file/VanillaTweaks_r890331.zip (incompatible), file/MilkywayGalaxyUNIVERSAL.zip (incompatible)
    Current Language: English (United Kingdom)
    CPU: 12x Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz
    OptiFine Version: OptiFine_1.16.3_HD_U_G3
    OptiFine Build: 20200916-082411
    Shaders: null
    OpenGlVersion: null
    OpenGlRenderer: null
    OpenGlVendor: null
    CpuCount: 0

 

Thank you, diesieben07; I downloaded the preview version of Optifine (OptiFine HD U G4 pre1) and replaced the previous version with the preview version.  That resolved the issue and MC is loading and joining worlds without any issue now.  Please do feel free to close this topic. 

 

Once again, thank you for the quick response.