ruby on rails - I'm trying to create PDF's with Prawn, but I get: Prawn::Errors::UnrecognizedTableContent -

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I am following this RailCags # 153, and I am trying to add table data to prawns. I keep getting this error: 

  shrimp :: errors :: unchanging table content    
 
 
 See, because prawns will be confused if your table contains a zero or non-string value. Try using the .to_s method.  
  Example   
  @ report.data.to_s

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