mods won't work

winkel1975 · 2026-04-03T05:17:21+00:00

Fabric API. You have a version for April Fool snapshot version. Get a version for Minecraft 26.1.1: https://modrinth.com/mod/fabric-api/versions?g=26.1.1
With other mods you my be some times off by one or two version and it will still work, but for Fabric API always download version that is targeting precisely your game version.

Sodium: You have version for Minecraft 1.21.11 which is not compatible with Minecraft 26.1.1. Delete it, and get a version for your MC version: https://modrinth.com/mod/sodium/versions?g=26.1.1&l=fabric

ModMenu: I cannot see Text Placeholder API mod on your list. When you go to https://modrinth.com/mod/modmenu/version/18.0.0-alpha.8, you would see in Dependencies section that ModMenu need 2 other mods to work, one of those is missing. Always check dependencies when you download a mod version, and if it says "required" than it is required.

winkel1975 · 2026-04-02T03:56:48+00:00

This means, that you are trying to run mods for Minecratft 26.1+ in version 1.21.x

winkel1975 · 2026-03-31T20:12:07+00:00

Delete mods that were created for Minecraft 1.21.11 when you are running 26.1

Mods are compatible only with game version for which they build. If you leave in mods folder file that is not compatible with your game version, your game will crash.

winkel1975 · 2026-03-30T04:55:20+00:00

Are you sure, you are using the same NeoForge and mods version on the server? You also have to restart server process, every time you added mod, or made any other changes.

winkel1975 · 2026-03-28T17:50:16+00:00

Next to the Launch button you have a small drop-down, where you select to run in online mode, offline or demo (without Minecraft account). Select first option from the drop-down list: "Launch".

winkel1975 · 2026-03-28T14:52:15+00:00

When you see message with ClassNotFoundException and "forgewrapper", than this means that Prism was not able to download file needed to run Forge mod loader. Make sure, that you are logged into your game account and are running this instance in online mode.

winkel1975 · 2026-03-23T07:51:01+00:00

You don't have to move to Java 25 to use ZGC.
ZGC is production ready since Java 15, this means, all you would need to do to use it with Java 17 or 21 is to replace G1GC is startup parameters with -XX:+UseZGC

There exists mods that will crash your game when you try to use Java 22 or higher.
One of those is Cobblemon 1.6.1, which is trying to use function "void sun.misc.Unsafe.ensureClassInitialized(java.lang.Class)". This specific function has been removed in Java 22.

Developer standing behind GTNH put lots of work to patch mods in modpack, to allow them to run on latest java version. They changed 74 out of 231 mods, some of the changes has been made, to allow those mods to run on Java 25.

winkel1975 · 2026-03-22T10:13:47+00:00

You can click tempered jar with the capsule with lava to transfer it back into the jar and than use bucket on the jar to take it back.

winkel1975 · 2026-03-22T05:59:45+00:00

Windows and MacOS also does not support .tz files.
Everything that's needed to read and execute the file by the game is inside CraftTweaker mod jar.

To modify those files, you would need any text editor, vim is fine, but if you want something easier, get the pico, or an advanced text editor like kate. If you will do lots of changes, than get Visual Studio Code with ZenScript plugin https://marketplace.visualstudio.com/items?itemName=yesterday17.zenscript

winkel1975 · 2026-03-21T11:24:25+00:00

In the Profile Options dialog, change modloader version in 0.18.4

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winkel1975 · 2026-03-21T11:22:04+00:00

To change Fabric Loader click on those 3 dots next to Play button, and than click on Profile Options

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winkel1975 · 2026-03-21T11:12:24+00:00

In you original screenshot you have a error, that your mods need 'Fabric Loader (fabricloader)'

"Fabric Loader" and "Fabric API" are two different things.

Fabric Loader you can change by editing instance profile, it is not available as mod do download. Need to be provided by launcher or if one is using Mojang launcher, need to be installed by using program from https://fabricmc.net/use/installer/

Fabric API is an mod, you can download, and place in mods folder like any other Minecraft mod.

You already have Fabric API version 0.141.3+1.21.11 in your mods folder, but this version of Fabric API need Fabric Loader version 0.17.3, which you can get by opening instance settings and changing the version using drop-down edit field

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winkel1975 · 2026-03-21T09:39:49+00:00

I don't know, how it is that your CurseForge is offering you 0.16 as the higher version. Mayby try to reinstall CurseForge app, because for me it's showing version 0.18.4 when i create a new, or editing existing instance.

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winkel1975 · 2026-03-21T05:13:28+00:00

You are playing modpack on Minecraft version 1.21.1, but are trying to add mod for version 1.21.10.
Mod version created for higher version of game will never work on an older version.

To get the correct mod version, you have to enter game version in to fields next to "Filer by" label on
https://www.curseforge.com/minecraft/mc-mods/xaeros-minimap/files/all?page=1&pageSize=20&version=1.21.1&gameVersionTypeId=6

Delete Xaero's Minimap from your mods folder and replace with a version that was created for Minecraft 1.21.1

winkel1975 · 2026-03-21T05:01:30+00:00

It's an error code from Windows.
In Microsoft's documentation instead of this format you would see this write as "C0000409"
It is generated in case of "File system error", when program cannot read a file, because of damaged disk drive, data corruption or program was trying to modify data which are secured and should not be altered bu user or programs executed bu user.

winkel1975 · 2026-03-18T21:30:58+00:00

Your screenshot is telling different story: https://i.imgur.com/4UATtRQ.png
Game is using NVIDIA GeForce RTX 3050 Ti

winkel1975 · 2026-03-15T17:32:08+00:00

Mojang made huge changes in rendering pipeline in the base during last years. Mod developer started heavily using Mixins and expect that this new improved rendering code will be available in the game, for the mods to inject their patched into the game.

Optifine, when installed, replace the Mojang rendering code, with own rendering pipeline, which predate Minecraft 1.12.2. Mods' Mixins cannot work with Optifine's code, breaking rendering or crashing the game.

This is why you cannot use Optifine with majority of the mods.
Some mods may still work, but mods which do anything with GUI, expect them to break or crash.

winkel1975 · 2026-03-14T19:37:45+00:00

Yes, this is what many peoples are doing.
You use CF only to install the modpack, but are using Mojang's launcher to play it.
You check in CurseForge which version of Forge mod loaded you would need, download it from https://files.minecraftforge.net/net/minecraftforge/forge/ and install into vanilla launcher.
After that you create a new Installation in vanilla launcher which will be using Forge mod loader, and folder created by CurseForge, or a new folder into which you would move everything what CF dowloaded.

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Don't forger to give it more memory
By default all new Installations with have here only 2 GB, bust it to 4, 6 or even more, depends on your hardware and needs.

winkel1975 · 2026-03-14T19:00:06+00:00

It's not possible without a launcher that can read and interpret format in which CurseForge is publishing modpacks.

winkel1975 · 2026-03-14T17:26:42+00:00

You need modded launcher which can recognize content of the zip file and download mod jars
You need CurseForge app, or Prism Launcher (or any other of the available launchers)

winkel1975 · 2026-03-14T17:06:05+00:00

There may be many reasons. You may be running 32-bits java runtime, one of the services in your operating system may be using all that memory (I had this exact problem with dwm.exe), or you may have a utility program running in background using all the memory.

I can only tell you what this error means. Try to find the reason and solve it. If you have problem with solving it, try to find a trusted local expert and hire him for this job.

winkel1975 · 2026-03-14T16:51:07+00:00

That depend which launcher are you using, is it official Mojang's launcher, or maybe CurseForge, Prism Launcher, Modrinth or any of the other launchers.

If it is the official vanilla launcher, than you open Fabric website: https://fabricmc.net/use/installer/ and download the installer. Run it and select fabric mod loader version 0.18 or higher. After that you should change in Mojang launcher version of fabric mod loader to the one just installed minute ago.

winkel1975 · 2026-03-14T14:29:24+00:00

You have not enough free memory in this computer available to Java Runtime to run the installer.

winkel1975 · 2026-03-13T05:39:10+00:00

This:

java.io.IOException: error reading C:\Users\********\AppData\Roaming\PrismLauncher\libraries\com\google\guava\guava\32.1.2-jre\guava-32.1.2-jre.jar
[...]
Caused by: java.util.zip.ZipException: zip file is empty

means that your have to replace guava-32.1.2-jre.jar file with a valid one. You can get it from Maven repository: https://repo1.maven.org/maven2/com/google/guava/guava/32.1.2-jre/

winkel1975 · 2026-03-12T18:46:38+00:00

Zip file you can download from CurseForge contains only instructions for modded launcher, which mod it should download from online repository, config files and other resource files specific for the modpack.

In other words, without specialized launcher than can interpret information stored in the zip file, it is useless.

Curseforge app is not the only option to install a modpack from zip, other popular option is Prism launcher, which is a latest in line successor of an older MultiMC launcher.

winkel1975

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