The index.xml file is missing.
How do I fix this error: The index.xml file is missing.????
MacBook Pro 13″, macOS 10.13
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As far as I know this only happens when trying to open a "newer" Numbers document using Numbers '09. It was a prevalent problem a decade ago when a lot of people had Numbers '09 and Numbers 3 on the same machine. Now there are not many people who have Numbers '09.
Start up Numbers then drag a file and drop it on the Numbers icon on the dock. Does it open?
You may have to "get info" on a file and set the default app back to the newer version of Numbers. And choose to apply it to all.