There was an issue came from spreadsheet , please look at
http://github.com/hmcgowan/roo/issues/#issue/6
, i only using spreadsheet without roo, also got the same effect.
The error message looks like this: /gems/spreadsheet-0.6.4.1/lib/spreadsheet/excel/workbook.rb:67:in `shared_string': undefined method `content'
for nil:NilClass
I think it's match with the bug report
http://rubyforge.org/tracker/index.php?func=detail&aid=28007&group_id=678&atid=2677
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Undefined method "content" for nil [ reply ]