Whenever I try to launch Minecraft in the launcher, it gives me this error:

Unable to access file.
URL: http://resources.download.minecraft.net/71/71c6b7510b94bd74631f9e045bdb733cda1fe13a
Error details: The file or directory is corrupted and unreadable
Filename on disk: 71c6b7510b94bd74631f9e045bdb733cda1fe13a
Path: C:/Users\Gabby\AppData\Roaming\.minecraft\assets\objects\71/71c6b7510b94bd74631f9e045bdb733cda1fe13a
Exists: false

Any idea? I'm assuming it's some file corruption, but i'm not sure how to obtain it back.