Help with csv converter

Hi, I have the following and I am getting NoMethodError: undefined method `arity’ for nil:NilClass - Can someone explain what is happening?

CSV::Converters[:RemoveChars] = lambda do |field| 
    field.gsub(/^[^a-z0-9\.,]{1,}/i, '')

def parse_csv(csv)
        options = {
          encoding: "bom|utf-8",
          skip_blanks: true, 
          headers: true,
          converters: :remove_chars

loop through csv here

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