code: def error_keys_not_found(self, keys):
          
          try:
              log.error("Filename: {0}".format(self['meta']['location']))
          except:
              log.error("Filename: {0}".format(self['location']))
          log.error("Key '{0}' does not exist".format('.'.join(keys)))
          indent = ""
          last_index = len(keys) - 1
          for i, k in enumerate(keys):
              if i == last_index:
                  log.error(indent + k + ": <- this value is missing")
              else:
                  log.error(indent + k + ":")
              indent += "    "
docs: Check if the requested keys are found in the dict.
  
          :param keys: keys to be looked for