[Rails] NoMethodError (undefined method `[]' for nil:NilClass)

Hi everyone this is the error that's been killing me, please tell
where i am missing.
I have upgraded my rails version from 1.2.3 to 2.3.2 and have
installed active_scaffold plugin, since then this error started which
was not there in older version.

This is the log output:

Processing AccountController#consumer_home (for 122.167.8.236 at
2009-07-31 09:02:22) [GET]

NoMethodError (undefined method `[]' for nil:NilClass):
  app/controllers/account_controller.rb:566:in `paginate_by_sql'
  app/controllers/account_controller.rb:623:in `consumer_home'
Rendering /home/v8354a/public_html/projectbidding/public/500.html (500
Internal Server Error)

I have paginate_by_sql function in application_controller.rb file
which is shown below will call Paginator class.

def paginate_by_sql(model, sql, per_page, options={})
            if options[:count]
              if options[:count].is_a? Integer
                total = options[:count]
              else
                total = model.count_by_sql(options[:count])
              end
            else
              total = model.count_by_sql_wrapping_select_query(sql)
            end
            object_pages = Paginator.new self, total, per_page, @params
['page']
            objects = model.find_by_sql_with_limit(sql,
object_pages.current.to_sql[1], per_page)
            return [object_pages, objects]
        end

Please help

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