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Currently supported: All versions

Forge 1.12.2-14.23.2.2611 Will Not Start!

TobyMinceraft
in Support & Bug Reports

Featured Replies

Posted

Like another user here on the forums, I too have come up with a problem regarding this update of Forge.

 

While browsing through the comments and the original post, I can confirm I am running Java 8 (not 9), and have the same system requirements to be able to run Forge.
I have tried to uninstall Forge and reinstall it, but that did not help. If you want to know, I am also running 1.11.2 Forge, and it runs completely fine. However, I go to use 1.12 and it does not want to start. I can confirm again that it has successfully installed, but it is not starting when I choose "Play". I am using the Minecraft Launcher 1.6.67 (the old launcher) on a Windows 10 laptop. I have done the basic tests to see what all I have.

1) Correct Java version: Java 8.

2) Have I used 1.12.2 before? Answer: Yes.

3) Have I used Forge before? Answer: Yes.

4) Anything else you are using besides Forge? Answer: Yes. I am using OptiFine, in the mods folder, along with WorldEdit.

 

The output I get in the launcher is the following (a bit long):
"

Spoiler

[22:29:17] [main/ERROR] [LaunchWrapper]: Unable to launch
java.lang.reflect.InvocationTargetException: null
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_161]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_161]
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/world/storage/ISaveFormat
    at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?]
    ... 6 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.storage.ISaveFormat
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_161]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_161]
    at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?]
    ... 6 more
Caused by: java.lang.IncompatibleClassChangeError: Implementing class
    at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_161]
    at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_161]
    at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_161]
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_161]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_161]
    at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?]
    ... 6 more"

If anyone can help me with this, that will be greatly appreciated.

Side Note: I also run a Mac OS High Sierra MacBook Air, and I can run Minecraft 1.12.2 Forge just fine. It does not, however, work on my Windows 10 laptop for some reason. Please help me!

-- TobyMinceraft

Looks like WorldEdit needs a class that no longer exists, try removing WE and see if it loads

  • Author
1 hour ago, MoeBoy76 said:

Looks like WorldEdit needs a class that no longer exists, try removing WE and see if it loads

Here's the thing. I am running two versions that use WorldEdit, and want to keep both. Is there a way to do so?

  • Author

Alright, so here's the final verdict.

I have removed OptiFine from my mods folder, and installed WorldEdit for 1.12.2. Sure enough, Forge opened and is working. BUT...I have found it is not possible to have both the 1.11 and 1.12 versions of WorldEdit in the same mods folder. WorldEdit doesn't like that. Any idea of a bypass, to keep both versions of WorldEdit?

  • 1 year later...

You can create folders named after the version (e.g. "1.7.10" or "1.12.2") in your mods folder, then forge only uses the mods from the respective folder. (e.g. forge 1.12.2 uses the mods in the folder named 1.12.2).

Edited by DragonLite_HD

That is no longer correct DragonLite, just use launcher profiles/installations

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.

 

As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.

 

For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.

Spoiler

Logs (Most issues require logs to diagnose):

Spoiler

Please post logs using one of the following sites (Thank you Lumber Wizard for the list):

https://gist.github.com/: 100MB Requires member (Free)

https://pastebin.com/: 512KB as guest, 10MB as Pro ($$$)

https://hastebin.com/: 400KB

Do NOT use sites like Mediafire, Dropbox, OneDrive, Google Drive, or a site that has a countdown before offering downloads.

 

What to provide:

...for Crashes and Runtime issues:

Minecraft 1.14.4 and newer:

Post debug.log

Older versions:

Please update...

 

...for Installer Issues:

Post your installer log, found in the same place you ran the installer

This log will be called either installer.log or named the same as the installer but with .log on the end

Note for Windows users:

Windows hides file extensions by default so the installer may appear without the .jar extension then when the .log is added the log will appear with the .jar extension

 

Where to get it:

Mojang Launcher: When using the Mojang launcher debug.log is found in .minecraft\logs.

 

Curse/Overwolf: If you are using the Curse Launcher, their configurations break Forge's log settings, fortunately there is an easier workaround than I originally thought, this works even with Curse's installation of the Minecraft launcher as long as it is not launched THROUGH Twitch:

Spoiler
  1. Make sure you have the correct version of Forge installed (some packs are heavily dependent on one specific build of Forge)
  2. Make a launcher profile targeting this version of Forge.
  3. Set the launcher profile's GameDir property to the pack's instance folder (not the instances folder, the folder that has the pack's name on it).
  4. Now launch the pack through that profile and follow the "Mojang Launcher" instructions above.

Video:

Spoiler

 

 

 

or alternately, 

 

Fallback ("No logs are generated"):

If you don't see logs generated in the usual place, provide the launcher_log.txt from .minecraft

 

Server Not Starting:

Spoiler

If your server does not start or a command window appears and immediately goes away, run the jar manually and provide the output.

 

Reporting Illegal/Inappropriate Adfocus Ads:

Spoiler

Get a screenshot of the URL bar or copy/paste the whole URL into a thread on the General Discussion board with a description of the Ad.

Lex will need the Ad ID contained in that URL to report it to Adfocus' support team.

 

Posting your mod as a GitHub Repo:

Spoiler

When you have an issue with your mod the most helpful thing you can do when asking for help is to provide your code to those helping you. The most convenient way to do this is via GitHub or another source control hub.

When setting up a GitHub Repo it might seem easy to just upload everything, however this method has the potential for mistakes that could lead to trouble later on, it is recommended to use a Git client or to get comfortable with the Git command line. The following instructions will use the Git Command Line and as such they assume you already have it installed and that you have created a repository.

 

  1. Open a command prompt (CMD, Powershell, Terminal, etc).
  2. Navigate to the folder you extracted Forge’s MDK to (the one that had all the licenses in).
  3. Run the following commands:
    1. git init
    2. git remote add origin [Your Repository's URL]
      • In the case of GitHub it should look like: https://GitHub.com/[Your Username]/[Repo Name].git
    3. git fetch
    4. git checkout --track origin/master
    5. git stage *
    6. git commit -m "[Your commit message]"
    7. git push
  4. Navigate to GitHub and you should now see most of the files.
    • note that it is intentional that some are not synced with GitHub and this is done with the (hidden) .gitignore file that Forge’s MDK has provided (hence the strictness on which folder git init is run from)
  5. Now you can share your GitHub link with those who you are asking for help.

[Workaround line, please ignore]

 

  • 1 year later...

I'm having a simular issue with installing 1.12.2-14.23.2.2611, but it has nothing to do with the mods. I just did a regular download and reinstalled java 8 and it still didnt work. I don't know why but with a plain install it still wont work. Please help. Also, the mods i want to run wont work if i put in another version of 1.12.2, so your my last hope.

 

Error:

Exception in thread "main" java.lang.ExceptionInInitializerError
    at net.minecraftforge.installer.ClientInstall.getSponsorMessage(ClientInstall.java:401)
    at net.minecraftforge.installer.InstallerAction.getSponsorMessage(InstallerAction.java:60)
    at net.minecraftforge.installer.InstallerPanel.updateFilePath(InstallerPanel.java:334)
    at net.minecraftforge.installer.InstallerPanel.<init>(InstallerPanel.java:315)
    at net.minecraftforge.installer.SimpleInstaller.launchGui(SimpleInstaller.java:164)
    at net.minecraftforge.installer.SimpleInstaller.main(SimpleInstaller.java:51)
Caused by: java.lang.ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 1
    at net.minecraftforge.installer.MirrorData.buildMirrorList(MirrorData.java:84)
    at net.minecraftforge.installer.MirrorData.<init>(MirrorData.java:63)
    at net.minecraftforge.installer.MirrorData.<clinit>(MirrorData.java:17)
    ... 6 more
 

1.12 is no longer supported on this forum.
Please update to a modern version of Minecraft to receive support.

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https://forums.minecraftforge.net/topic/62921-forge-1122-142322611-will-not-start/
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