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A problem with my Minecraft Forge Server

Posted January 19, 20232 yr

Hi! My problem is simple; I've been trying for the past days to make a Forge Server with my friends, I've downloaded the server version of a modpack and tried to start the server with it, and it just doesn't work, and I don't have enough knowledge to understand where the error is, I already tried changing the Java version and it still doesn't work, I use Windows 11, in case this information is relevant. Thanks in advance. Here is apparently the error:
[19ene2023 16:08:45.810] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.811] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.813] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.823] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.824] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.825] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.833] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.836] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.838] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.841] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.842] [main/DEBUG] [mixin/]: Inner class uk/co/hexeption/aeinfinitybooster/mixins/MixinWirelessBlockEntity$1 in uk/co/hexeption/aeinfinitybooster/mixins/MixinWirelessBlockEntity on appeng/blockentity/networking/WirelessBlockEntity gets unique name appeng/blockentity/networking/WirelessBlockEntity$Anonymous$eb5586896669422caaddb2fed980eca9
[19ene2023 16:08:45.844] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.851] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.852] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.857] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.858] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.859] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.861] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.863] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.866] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.870] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.873] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.877] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.878] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.885] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.887] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.889] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.890] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.891] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.892] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.893] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.893] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.893] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.894] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.894] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.895] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.895] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.895] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.897] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.898] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.898] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.900] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.900] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.901] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.904] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.904] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.905] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.905] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.908] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.912] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.912] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.913] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.914] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.915] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.916] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.918] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.919] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.919] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.920] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.921] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.924] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.925] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.925] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.926] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.926] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.927] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.928] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.928] [main/WARN] [mixin/]: Error loading class: java/util/Map$Entry (java.lang.IllegalArgumentException: Unsupported class file major version 63)
[19ene2023 16:08:45.934] [main/DEBUG] [mixin/]: Prepared 687 mixins in 1,746 sec (2,5ms avg) (0ms load, 0ms transform, 0ms plugin)
[19ene2023 16:08:45.938] [main/DEBUG] [mixin/]: Mixing MainMixin from iceberg.mixins.json into net.minecraft.server.Main
[19ene2023 16:08:45.945] [main/WARN] [mixin/]: Error loading class: java/util/List (java.lang.IllegalArgumentException: Unsupported class file major version 63)

Quote

January 19, 20232 yr

Can you give a crash report? Crash reports usually have information on which mod went wrong.

Crash reports are in {server_directory}/crash-reports.

I'm not good at modding, but at least I can read a crash report (well enough). That's something, right?

Quote

January 19, 20232 yr

Use java 17, mixin does not support java 19

Boilerplate:

If you don't post your logs/debug.log we can't help you. For curseforge you need to enable the forge debug.log in its minecraft settings. You should also post your crash report if you have one.

If there is no error in the log file and you don't have a crash report then post the launcher_log.txt from the minecraft folder. Again for curseforge this will be in your curseforge/minecraft/Install

Large files should be posted to a file sharing site like https://gist.github.com You should also read the support forum sticky post.

Quote

January 19, 20232 yr

Author

28 minutes ago, Hipposgrumm said:

Can you give a crash report? Crash reports usually have information on which mod went wrong.

Crash reports are in {server_directory}/crash-reports.

It doesn't leave a crash report behind for some reason

Quote

January 19, 20232 yr

Can you give a debug.log then?

I'm not good at modding, but at least I can read a crash report (well enough). That's something, right?

Quote

January 19, 20232 yr

Author

19 minutes ago, warjort said:

Use java 17, mixin does not support java 19

Apparently I have 2 Javas installed at the same time, thank you so much I feel like an idiot

Quote

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By VictorEvers · Posted Tuesday at 08:42 PM2 days

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A problem with my Minecraft Forge Server

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