jopt-simple 5.0.3

This is popping up when i try to do mods on forge version 1.12.2:

Failed to download file, the file contents differ from what was expected.
Name: jopt-simple-5.0.3.jar
URL: https://libraries.minecraft.net/net/sf/jopt-simple/jopt-simple/5.0.3/jopt-simple-5.0.3.jar
Filename on disk: jopt-simple-5.0.3.jar
Path: C:\Users\user\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\5.0.3\jopt-simple-5.0.3.jar
Exists: File

Please help me!