def error(message = nil, ex = nil, data = nil, &block)
      log(ERROR, message, ex, data, block)
    end
def error(message = nil, ex = nil, data = nil, &block)
      log(ERROR, message, ex, data, block)
    end
Log any one or more of a message, an exception and structured data as ERROR.
 @return [Boolean] true
 @see Logging#debug