Problem while export to xls using spreadsheet gem in rails for Server

Rails
1

Hi All,

In my code

@format_text = @workbook.add_format(:bold =>false)

I get following error

undefined method `font’ for {:bold =>false}:Hash in
gems/spreadsheet-0.6.4/lib/spreadsheet/excel/writer/workbook.rb:352

when i try to export data into the XLS i am using following gems

spreadsheet --version 0.6.4
spreadsheet-excel --version 0.3.5.1

My problem is when i use same code with same gems it works fine on my
local application but same gives error on my heroku server

Regards,

Salil