For Rails 2.3 In line 619 you must to have:
    my_options = FileColumn::init_options(options, ActiveSupport::Inflector.underscore(self.name).to_s,
    attr.to_s)
    (as the first response) Then you should go to the file: file_column_helper.rb, go to line 79, and change the line: url

    — uninitialized constant FileColumn::ClassMethods::Inflector — WhatDoesThisErrorMean.com
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