def method_missing(meth, *args, &block)
      if meth.to_s =~ /\=$/
        key_name = meth.to_s.gsub(/\=$/,"")
        raise DoesFacebook::ConfigurationError.new("Unknown configuration key `#{key_name}` cannot be set for Facebook applications.")
      end
      super
    end
def method_missing(meth, *args, &block)
      if meth.to_s =~ /\=$/
        key_name = meth.to_s.gsub(/\=$/,"")
        raise DoesFacebook::ConfigurationError.new("Unknown configuration key `#{key_name}` cannot be set for Facebook applications.")
      end
      super
    end
Error in the case of an unknown key being configured: