Problem with parsing excel file using spreadsheet

Hi,

I am using ruby ruby 1.8.6 and spreadsheet (0.6.4).
I am trying to oarse an excel file.
My code is like :

    require 'rubygems'
    require 'spreadsheet'
    require 'parseexcel'
    equire 'parseexcel/parseexcel'
    require 'parseexcel/parser'

      workbook =
Spreadsheet::ParseExcel.parse("public/downloads/test.xls")
      worksheet = workbook.worksheet(0)

        worksheet.each { |row|
                puts row.at(0).to_s

        }

But it prints 'nil'. I have data in my excel file.

Could you please help me?

Thanks,
Anu