Forge 1.12.2 14.23.5.2846 no setup, java.lang.ExceptionInInitializerError

[StrikerMP_]

Hey.

So i want to play a modpack though I have the problem that I cannot install the Forge Version (or any version for Minecraft 1.12.2!!!!) you see in the title. If I try to install it via the Forge .exe I get the message below. If I try it via Curseforge/Overwolf it doesnt work as well. The problem stays either way.

The error message that Forge creates when I try to open the Installer:

 

java.net.preferIPv4Stack=true
Exception in thread "main" java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at net.minecraftforge.installer.Java6Gate.main(Java6Gate.java:48)
Caused by: 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:167)
    at net.minecraftforge.installer.SimpleInstaller.main(SimpleInstaller.java:54)
    ... 5 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 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)
    ... 11 more
 

I know that this issue is known, yet I have not found a solution. Of course I tried reinstalling everything, trying different versions and installing new drivers etc.

Please note that I can install and use other Forge versions for other Minecraft version but 1.12.2 .

 

I would really appreciate any help.

[Luis_ST]

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

[StrikerMP_]

Since I dont have the problem on other versions I will try it on another forum. 

Edited October 9, 2021 by StrikerMP_