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ErrorLloadingClass:java/lang/invoke/MethodHandles$Lookup(java.lang.IllegalArgumentException:UnsupportedClassFileMajorVersion 66

didn't read faq

Posted April 9, 20241 yr

Hello, I was trying to host a forge server with mods and it keeps on telling me ( Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66 ) press any key to continue then closes. i removed the mods, started it and it went well. so i tried to import a generated world with the mods and imported the mods again and it keeps on giving me the same issue.
here is the server logs:

[09Apr2024 07:41:40.853] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: ModLauncher running: args [--launchTarget, forgeserver, --fml.forgeVersion, 43.3.0, --fml.mcVersion, 1.19.2, --fml.forgeGroup, net.minecraftforge, --fml.mcpVersion, 20220805.130853]
[09Apr2024 07:41:40.858] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: ModLauncher 10.0.8+10.0.8+main.0ef7e830 starting: java version 22 by Oracle Corporation; OS Windows 10 arch amd64 version 10.0
[09Apr2024 07:41:43.595] [main/INFO] [mixin/]: SpongePowered MIXIN Subsystem Version=0.8.5 Source=union:/D:/Minecraft/Forge%20Server%201/libraries/org/spongepowered/mixin/0.8.5/mixin-0.8.5.jar%2363!/ Service=ModLauncher Env=SERVER
[09Apr2024 07:41:44.116] [main/WARN] [net.minecraftforge.fml.loading.moddiscovery.ModFileParser/LOADING]: Mod file D:\Minecraft\Forge Server 1\libraries\net\minecraftforge\fmlcore\1.19.2-43.3.0\fmlcore-1.19.2-43.3.0.jar is missing mods.toml file
[09Apr2024 07:41:44.162] [main/WARN] [net.minecraftforge.fml.loading.moddiscovery.ModFileParser/LOADING]: Mod file D:\Minecraft\Forge Server 1\libraries\net\minecraftforge\javafmllanguage\1.19.2-43.3.0\javafmllanguage-1.19.2-43.3.0.jar is missing mods.toml file
[09Apr2024 07:41:44.187] [main/WARN] [net.minecraftforge.fml.loading.moddiscovery.ModFileParser/LOADING]: Mod file D:\Minecraft\Forge Server 1\libraries\net\minecraftforge\lowcodelanguage\1.19.2-43.3.0\lowcodelanguage-1.19.2-43.3.0.jar is missing mods.toml file
[09Apr2024 07:41:44.211] [main/WARN] [net.minecraftforge.fml.loading.moddiscovery.ModFileParser/LOADING]: Mod file D:\Minecraft\Forge Server 1\libraries\net\minecraftforge\mclanguage\1.19.2-43.3.0\mclanguage-1.19.2-43.3.0.jar is missing mods.toml file
[09Apr2024 07:41:44.328] [main/INFO] [net.minecraftforge.fml.loading.moddiscovery.JarInJarDependencyLocator/]: Found 6 dependencies adding them to mods collection
[09Apr2024 07:41:44.388] [main/ERROR] [net.minecraftforge.fml.loading.ModSorter/LOADING]: Missing or unsupported mandatory dependencies:
Mod ID: 'forge', Requested by: 'melody', Expected range: '[43.3.5,)', Actual version: '43.3.0'
Mod ID: 'forge', Requested by: 'fancymenu', Expected range: '[43.3.5,)', Actual version: '43.3.0'
[09Apr2024 07:41:46.235] [main/INFO] [mixin/]: Compatibility level set to JAVA_17
[09Apr2024 07:41:46.260] [main/ERROR] [mixin/]: Mixin config justhammers.mixins.json does not specify "minVersion" property
[09Apr2024 07:41:46.272] [main/ERROR] [mixin/]: Mixin config betterfurnaces-common.mixins.json does not specify "minVersion" property
[09Apr2024 07:41:46.272] [main/ERROR] [mixin/]: Mixin config betterfurnaces.mixins.json does not specify "minVersion" property
[09Apr2024 07:41:46.289] [main/ERROR] [mixin/]: Mixin config factoryapi-common.mixins.json does not specify "minVersion" property
[09Apr2024 07:41:46.289] [main/ERROR] [mixin/]: Mixin config factoryapi.mixins.json does not specify "minVersion" property
[09Apr2024 07:41:46.349] [main/INFO] [mixin/]: Successfully loaded Mixin Connector [com.sonicether.soundphysics.MixinConnector]
[09Apr2024 07:41:46.350] [main/INFO] [mixin/]: Successfully loaded Mixin Connector [org.tlauncher.MixinConnector]
[09Apr2024 07:41:46.351] [main/INFO] [mixin/]: Successfully loaded Mixin Connector [de.maxhenkel.car.MixinConnector]
[09Apr2024 07:41:46.353] [main/INFO] [cpw.mods.modlauncher.LaunchServiceHandler/MODLAUNCHER]: Launching target 'forgeserver' with arguments []
[09Apr2024 07:41:46.375] [main/INFO] [Rubidium/]: Loaded configuration file for Rubidium: 30 options available, 0 override(s) found
[09Apr2024 07:41:46.378] [main/WARN] [mixin/]: Reference map 'insanelib.refmap.json' for insanelib.mixins.json could not be read. If this is a development environment you can ignore this message
[09Apr2024 07:41:46.388] [main/WARN] [mixin/]: Reference map 'justhammers-forge-forge-refmap.json' for justhammers.mixins.json could not be read. If this is a development environment you can ignore this message
[09Apr2024 07:41:46.393] [main/WARN] [mixin/]: Reference map 'BetterFurnaces-common-refmap.json' for betterfurnaces-common.mixins.json could not be read. If this is a development environment you can ignore this message
[09Apr2024 07:41:46.394] [main/WARN] [mixin/]: Reference map 'BetterFurnaces-forge-refmap.json' for betterfurnaces.mixins.json could not be read. If this is a development environment you can ignore this message
[09Apr2024 07:41:46.401] [main/WARN] [mixin/]: Reference map 'FactoryAPI-common-refmap.json' for factoryapi-common.mixins.json could not be read. If this is a development environment you can ignore this message
[09Apr2024 07:41:46.406] [main/WARN] [mixin/]: Reference map '${refmap_target}refmap.json' for corgilib.forge.mixins.json could not be read. If this is a development environment you can ignore this message
[09Apr2024 07:41:46.450] [main/INFO] [Canary/]: Loaded configuration file for Canary: 117 options available, 0 override(s) found
[09Apr2024 07:41:46.848] [main/ERROR] [net.minecraftforge.fml.loading.RuntimeDistCleaner/DISTXFORM]: Attempted to load class net/minecraft/client/player/AbstractClientPlayer for invalid dist DEDICATED_SERVER
[09Apr2024 07:41:46.849] [main/WARN] [mixin/]: Error loading class: net/minecraft/client/player/AbstractClientPlayer (java.lang.RuntimeException: Attempted to load class net/minecraft/client/player/AbstractClientPlayer for invalid dist DEDICATED_SERVER)
[09Apr2024 07:41:46.850] [main/WARN] [mixin/]: @Mixin target net.minecraft.client.player.AbstractClientPlayer was not found tlskincape-mixins.json:MixinAbstractPlayer
[09Apr2024 07:41:46.851] [main/ERROR] [net.minecraftforge.fml.loading.RuntimeDistCleaner/DISTXFORM]: Attempted to load class net/minecraft/client/gui/screens/TitleScreen for invalid dist DEDICATED_SERVER
[09Apr2024 07:41:46.851] [main/WARN] [mixin/]: Error loading class: net/minecraft/client/gui/screens/TitleScreen (java.lang.RuntimeException: Attempted to load class net/minecraft/client/gui/screens/TitleScreen for invalid dist DEDICATED_SERVER)
[09Apr2024 07:41:46.851] [main/WARN] [mixin/]: @Mixin target net.minecraft.client.gui.screens.TitleScreen was not found tlskincape-mixins.json:MixinMainMenu
[09Apr2024 07:41:46.852] [main/WARN] [mixin/]: Error loading class: net/minecraft/client/model/PlayerModel (java.lang.ClassNotFoundException: net.minecraft.client.model.PlayerModel)
[09Apr2024 07:41:46.853] [main/WARN] [mixin/]: @Mixin target net.minecraft.client.model.PlayerModel was not found tlskincape-mixins.json:MixinPlayerModel
[09Apr2024 07:41:46.854] [main/ERROR] [net.minecraftforge.fml.loading.RuntimeDistCleaner/DISTXFORM]: Attempted to load class net/minecraft/client/gui/Gui for invalid dist DEDICATED_SERVER
[09Apr2024 07:41:46.855] [main/WARN] [mixin/]: Error loading class: net/minecraft/client/gui/Gui (java.lang.RuntimeException: Attempted to load class net/minecraft/client/gui/Gui for invalid dist DEDICATED_SERVER)
[09Apr2024 07:41:46.855] [main/WARN] [mixin/]: @Mixin target net.minecraft.client.gui.Gui was not found car.mixins.json:GuiMixin
[09Apr2024 07:41:46.863] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.864] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.869] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.870] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.871] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.885] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.886] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.886] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.887] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.888] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.889] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.890] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.892] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.898] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.900] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.902] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.902] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.903] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.904] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.905] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.907] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.908] [main/WARN] [mixin/]: Error loading class: java/util/concurrent/ForkJoinPool$ForkJoinWorkerThreadFactory (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.908] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.909] [main/WARN] [mixin/]: Error loading class: java/util/concurrent/ForkJoinPool$ForkJoinWorkerThreadFactory (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.909] [main/WARN] [mixin/]: Error loading class: java/lang/Thread$UncaughtExceptionHandler (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.910] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.911] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.912] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.913] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.914] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.914] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.915] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.917] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.918] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.919] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.920] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.922] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.924] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.925] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.926] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.928] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.930] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.931] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.934] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.934] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.935] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.935] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.936] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.937] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.942] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.943] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.944] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.947] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 66)
[09Apr2024 07:41:46.950] [main/INFO] [MixinExtras|Service/]: Initializing MixinExtras via com.llamalad7.mixinextras.service.MixinExtrasServiceImpl(version=0.3.2).
[09Apr2024 07:41:46.960] [main/WARN] [mixin/]: Error loading class: java/lang/Thread (java.lang.IllegalArgumentException: Unsupported class file major version 66)

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April 9, 20241 yr

Use java 17 instead of Java 22

Try my Modpack

>>Link to Curseforge<<

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[SOLVED] Guys, please help me get through this horrible NoClassDefFound exception.

Well, needing help for this didn't last nearly as long as I expected, lol. I figured out the solution, and it's a real face palmer. Basically, the function Type.getInternalName(Class<?> clazz) does NOT work for classes that are obfuscated. This means that it won't work for basically every minecraft class. So running it with the argument EntityTrackerEntry.class won't work, but running it with CustomHandler.class will work! Annoying, but a still bit interesting. So I just replaced my call for Type.getInternalName(EntityTrackerEntry.class) with just "os", as that is the name of the actual class for EntityTrackerEntry at runtime. Hope this solution helps somebody. In the meantime, I'm going to mark this thread as solved.

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By CravenCraft · Monday at 07:40 PM1 day
How do you add a mob to spawn around a existing vanilla structure?

Hey dawg!

I think I might be able to help you out with your issue here. I say might because I don't know about 1.16.x or any later version, but I know how to do this kind of thing for 1.12.2 forge. Basically, in the pre-init or init (I don't really remember which one) you just gotta'

Okay, ykw, I just downloaded the 1.14.4 1.20.1 minecraft mdk. I think I actually can help you here. So, the 1.12.2 method actually doesn't work with 1.20.1 minecraft or later. Probably not too far before either. I see two options here for ya':

First, it's important to note that the game stores its spawn data for structures in, well, the Structures class. Here, the game initializes an instance of each Structure class and registers them with the BootstrapContext using its bootstrap function. Each instance of a Structure class is registered with a StructureSettings class as an argument. One of the arguments, the one that you're probably going to be particularly interested in here, would be the spawnOverrides argument. For this argument, the game uses a Map between MOB_CATEGORIES and StructureSpawnOverride. StructureSpawnOverride is essentially the juice of it here. It contains almost everything you would need to control how your custom mob spawns in Pillager Outposts. Now, if you want to change how the Structure class for the pillager outposts is registered with the BootstrapContext in the bootstrap function, you're going to want to change where the function's caller gets the function and replace it with your own custom version of this function. How might you do this? This is where it gets a little tricky. The bootstrap function for the structures class is referenced in VanillaRegistries.BUILDER. However, unfortunately, this field is private and final, so you can't directly change it with reflections, but you can still access it with reflections. Now the VanillaRegistries.BUILDER field is of the type RegistrySetBuilder, which uses a private final field "entires", which is set as a List<RegistrySetBuilder.RegistryStub<?>> type. So here, you could use reflections to access this list field and remove the entry for the structures bootstrap. Then you might be able to create your own structures class and add change the bootstrap function to reflect the changes you wish. Then finally, simply re-add the Structure entry that you made to the list, and you should be completely done! Keep in mind, I haven't actually tested this, so I'm not sure if it would actually work, and even if it did work it's really unorthodox, so I would recommend trying this next idea.

When the game is deciding whether or not to spawn an entity, if the entity is registered with the SpawnPlacements class, is uses the function you specify in the entity class to determine whether or not the entity can spawn in a certain spot. For example, the guardian cannot spawn on a block that is exposed to light from underwater because of this function. So what you could do is make a checkSelfSpawnRules function for your mob and register it with the SpawnPlacements function. Then, you could have your checkSelfSpawnRules function take into account if the block it's trying to spawn on is near a Pillager Outpost. Finally, you can get the coordinates to the chunk of your block and iterate through the ServerLevels in your MinecraftServer class and get their chunk sources and test if the chunk source has the chunk of your block position. If it does, you can then get the StructureManager from the ServerLevel. In there should be some very helpful functions for you to use. Although this is a bit more orthodox, it might be a bit laggy.

It's really up to you which of these options you choose. If you need some additional clarification then please let me know, I would be happy to help you out! Also let me know if any of these options hit your goals for what your looking for here or not. If not then just let me know; I could probably find another method you could try.

By Jackson Perr · Monday at 06:27 PM1 day

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ErrorLloadingClass:java/lang/invoke/MethodHandles$Lookup(java.lang.IllegalArgumentException:UnsupportedClassFileMajorVersion 66

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