def dump_error(error)
			error_message = [
				"#{Time.now.strftime('%Y-%m-%d %H:%M:%S')} - " \
				"#{error.class} - #{error.message}:",
				*error.backtrace
			].join("\n\t")
			@env[Rack::RACK_ERRORS].puts(error_message)
		end
def dump_error(error)
			error_message = [
				"#{Time.now.strftime('%Y-%m-%d %H:%M:%S')} - " \
				"#{error.class} - #{error.message}:",
				*error.backtrace
			].join("\n\t")
			@env[Rack::RACK_ERRORS].puts(error_message)
		end
Add error's backtrace to @env['rack.errors'] (terminal or file)
 @param error [Exception] exception for class, message and backtrace