> Here is the error:
> /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/base.rb:2962:in
> `log_protected_attribute_removal': undefined method `debug' for
> nil:NilClass (NoMethodError)
>         from

Have you tried a very simple function where you parse a very small 
spreadsheet dataset? Once that is working, build up from there?

You might find you have nil when you expected some value returned from 
your spreadsheet. It will be a matter of finding the source of that 
'nil'
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