After the Numbers 2.2.1 iPad app update, my spreadsheets won't open as it says the file format is invalid

I have been using the 1.4 version of Numbers for some time on my iPad. After updating to the 2.2.1 version, my files can no longer be accessed as when I click to open them they display the message "Spreadsheet can't be imported - the file format is invalid". The files will not upload to icloud, send, copy or open in another app. Can anybody help?

Just to mention it: My iPad (also on 4.2.1) syncs fine so far.

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After the Numbers 2.2.1 iPad app update, my spreadsheets won't open as it says the file format is invalid

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