Minecraft vanilla files dissapeared?

i went to boot up a modpack i had on twitch and minecraft kept crashing with a message saying something about vanilla installed incorrectly. It was working yesterday and not today? I have never had the official launcher downloaded off the minecraft website so i know this is not the cause? Is this something ive done or has twitch corrupted the files?

This is a developer community for Twitch, for Minecraft support you’ll have to contact CurseForge support.

Okay thanks!

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