Numbers file is locked
I was working on a Numbers file and it got locked all of a sudden. It says that my document cannot be reverted. It also says "This document can no longer be used because it's file has become unreadable, so it must be closed.
I tried checking the get info->locked checkbox, and it it unchecked.
If I close the document I will lose everything on there, is there a solution to this? Thanks!
MacBook Air 13″, macOS 11.2