minecraft twich modpacks wont work

I have been looking around the internet for the past several hours now and I really havnt found anything. I have also tried reinstalling both Minecraft and twitch but nothing has worked. 

Every time I try to launch a Minecraft 

modpack on twitch it doesn't work. I press the play button and it gives me a error that says this.

 

URL: https://launchermeta.mojang.com/v1/packages/1584b57c1a0b5e593fad1f5b8f78536ca640547b/1.12.json
Filename on disk: 1.12.json
Path: C:/Users\jeffi\OneDrive\Documents\Curse\Minecraft\Install\assets\indexes/1.12.json
Exists: true