rubyXL
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Excel requires repair
I only have this problem with this file and only when my woorkbook has many worksheets on it

same problem here and the ms office 10 error message does not offer any further infos :-(
I ran into a similar issues when adding an Input Message to a Data Validation field that exceeded 255 chars.
same problem
I ran into this issue and "fixed it" by:
- opening the excel and allowing Excel to repair it
- use the new repaired excel as the template for RubyXL to open
And the error just got fixed for new exports. I really don't know why but it worked.
Give it a try.