Pages Issue

Hi I'm having problems with my pages. It was working fine las night, but when I went in to open my documents this morning, it would do anything. It simply wouldn't let me open the document. It won't let me edit or delete or make copies or print or email or anything! I checked my update history, it's a 1.6.2 version and updated on the 16th September 2012 and doesn't have any new updates available.

Please help!!!

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