You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: errors.rb
    path of file: ./repos/koala/lib/koala
    
    the code of the file until where you have to start completion: module Koala

  class KoalaError < StandardError; end

  module Facebook

    # The OAuth signature is inc
    
      def json_parse_for(error_info, key)
        string = error_info[key]
        return if string.nil?

        JSON.parse(string)
      rescue JSON::ParserError => e
        Koala::Utils.logger.error("#{e.class}: #{e.message} while parsing #{key} = #{string}")
        nil
      end