An unexpected error has occurred and the game has crashed

[mandalffiganforth]

I am trying to run 1.12.2-forge1.12.2-14.23.2.2624 and everytime I click play, the launcher just gives me this stupid message with no crash report "An unexpected error has occurred and the game has crashed. We're sorry for the inconvenience." I have no mods for this version, and I've tried every other kind of forge available for 1.12+. I don't understand why it wont run. If someone could help me out, that would be great

 

Side note: when I install forge, it doesn't automatically set up a profile. I know how to create a profile, so it's not much of a problem

[Arkyo]

Bro wheres your log

[mandalffiganforth]

  On 3/6/2018 at 8:57 AM, Arkyo said:

Bro wheres your log

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Oops! forgot to add that.

here it is.2018-03-05-7.log.gz

[mandalffiganforth]

  On 3/7/2018 at 9:01 AM, diesieben07 said:

Post logs/fml-client-latest.log.

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UPDATE: Through some testing of my own, I have gotten it to work.

fml-client-latest.logFetching info...

Edited March 8, 2018 by mandalffiganforth

[Arkyo]

  On 3/8/2018 at 5:00 AM, mandalffiganforth said:

UPDATE: Through some testing of my own, I have gotten it to work.

fml-client-latest.logFetching info...

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Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.relauncher.IFMLLoadingPlugin
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_25]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[?:1.8.0_25]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_25]
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:455) ~[?:1.8.0_25]
	at java.net.URLClassLoader.access$100(URLClassLoader.java:73) ~[?:1.8.0_25]
	at java.net.URLClassLoader$1.run(URLClassLoader.java:367) ~[?:1.8.0_25]
	at java.net.URLClassLoader$1.run(URLClassLoader.java:361) ~[?:1.8.0_25]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_25]
	at java.net.URLClassLoader.findClass(URLClassLoader.java:360) ~[?:1.8.0_25]
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
	at java.lang.Class.forName0(Native Method) ~[?:1.8.0_25]
	at java.lang.Class.forName(Class.java:344) ~[?:1.8.0_25]
	at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:592) ~[forge-1.12.2-14.23.2.2624.jar:?]
	at net.minecraftforge.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:427) ~[forge-1.12.2-14.23.2.2624.jar:?]
	at net.minecraftforge.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:254) ~[forge-1.12.2-14.23.2.2624.jar:?]
	at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:100) ~[forge-1.12.2-14.23.2.2624.jar:?]
	... 5 more

 

 

Highly recommend you just remove .minecraft\version\<forge 2624> and reinstall it

EDIT: Read the next comment

Edited March 9, 2018 by Arkyo
Wrong explanation

[Arkyo]

  On 3/9/2018 at 4:12 PM, diesieben07 said:

No...

 

You have a mod for 1.7.10 or earlier installed. Remove it.

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cpw.mods.fml.relauncher.IFMLLoadingPlugin

This is a old class from Forge 1.7.10 or earlier?

Edited March 9, 2018 by Arkyo

[Arkyo]

  On 3/9/2018 at 4:17 PM, diesieben07 said:

Yes.

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Oh I see. I don't even know what is OptiFine back in the old days

[iTzAndreCoD]

I fixed it by uninstalling minecraft then pressing ‘Windows button+R’ wrote ‘%appdata%’ and deleted the .minecraft folder and didn’t backup anything because when i backed up texture-packs it didn’t fix it then i installed forge 1.12.2 (14.23.5.2768) without running 1.12.2 first and it fixed it.

hope that this helped you.

(will edit and tell you if it works for other versions too)

Edited April 18, 2020 by iTzAndreCoD

[DaemonUmbra]

Please don't necro old threads