Minecraft 1.12 Forge Crashing

[SwankyHam93 0]

Trying to run Minecraft 1.12 Forge and this error comes up

Failed to download file, the file contents differ from what was expected.
Name: jna-4.4.0.jar
URL: https://libraries.minecraft.net/net/java/dev/jna/jna/4.4.0/jna-4.4.0.jar
Filename on disk: jna-4.4.0.jar
Path: C:\Users\Ja'Crispy\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\jna\4.4.0\jna-4.4.0.jar
Exists: File

[diesieben07 6684]

1 hour ago, SwankyHam93 said:

C:\Users\Ja'Crispy\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\jna\4.4.0\jna-4.4.0.jar

Delete this file and try again.

[NodelDev 0]

On 11/14/2019 at 3:45 PM, diesieben07 said:

Delete this file and try again.

did it, doesn't work

[DaemonUmbra 358]

https://bugs.mojang.com/browse/MCL-12570

[Colm Murphy 0]

This has also been happening to me. I tried deleting the file and it still didn't work. This has something to do with Twitch, because Forge was working in 12.2 until I tried to install a mod (RLCraft) using Twitch, and it started crashing with the same error message after the mod download finished. I deleted the mod, and then forge started working again, but when I tried to install a different mod it started crashing again with the same message.