NamedError with Roo and xlsx

Ruby Error when accessing xlsx file using roo. This script was working
until recently my system crashed and then I had to reinstall the latest
versions of Ruby and Roo. now I am getting uninitialized constant (NamedError). The name a locatio of the file is correct, even
hardcoding the filename presents the same error.

I am running Ruby 1.9.3 and Roo 1.10.2
Here is the relevant part of the code:

require 'rubygems'
require 'roo'

class Fixnum
        def zeros
            "%0#{self}d" % 0

class String
    def numeric?
        # Check if every character is numeric

class BudgetParser
      def initialize(options)
        @budgetfile=File.basename(options[:file], '.*')
        @filename =
        @workbook =
        @workbook.default_sheet = options[:sheet] || 'Sheet1'
        @budget_year = options[:year] ||
        @conversions = %w(} J K L M N O P Q R)

Any help would be appreciated!

Problem is with latest version of roo 1.10.2, uninstalled that and
re-installed older version 1.9.5...the program now runs perfectly...