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Forge not working with new launcher

By austinblaze
July 1, 2019 in Support & Bug Reports

https://forums.minecraftforge.net/topic/72378-forge-not-working-with-new-launcher/

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austinblaze

Posted July 1, 2019

Forge is not working with the new minecraft launcher. I tried downloading the 1.12.2 minecraft forge and it says "java.lang.noclassdeffounderror", then I tried opening the 1.8.9 forge, this one worked without a single problem before the new launcher, and it will just crash unexpectedly. I've been trying to fix this for about 2 hours, and I've tried to find a way to downgrade the launcher, but I can't. Please help.

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jakey1995abc

Posted July 2, 2019

This needs fixing asap.

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DaemonUmbra

Posted July 2, 2019

Please read the "Logs" section of my signature below and provide the appropriate log in the appropriate manner.

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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.

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Logs (Most issues require logs to diagnose):

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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:

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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:

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Reporting Illegal/Inappropriate Adfocus Ads:

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Posting your mod as a GitHub Repo:

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[Workaround line, please ignore]

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https://forums.minecraftforge.net/topic/72378-forge-not-working-with-new-launcher/

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Forge not working with new launcher

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