I had a spreadsheet all saved with 2 months worth of my bills on it and i been doing this for months with no problems now I recently went to open it and it says can not open because index.xml is missing.

Any way of recovering this? This problem is weird to me because I can use Numbers for everything else and for all my older files still work and I didn't delete my folder its trying to open, its still sitting on my desktop?

Thanks in advance for any suggestions/fixes.