Pages won't read a current Pages document.
how can I recover this document that I have been working on for a week and suddenly I get this message?"Pages couldn’t read the file. You can try restoring to a previous version."
MacBook Pro Retina
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Restore your Pages document from your Time Machine backup using /Applications/Time Machine. You can use Quick Look and Get Info from that Time Machine interface to assess if you have the document that you want to restore.
Although Pages has a File menu > Revert To > Browse all versions, which behaves like the preceding Time Machine Restore process, you need to be able to open the document in the first place. If you are storing that Pages document on Google Drive, DropBox, or Microsoft OneDrive, you are playing with fire and that document may have been damaged.
You can try holding the shift-key when launching Pages and see if suppressing its last execution state allows you to open this document. You can try booting into Safe Boot mode, and attempt to open this document again, then reboot normally, and try one last time to open it.