function fail (message, code = 1) {
		if (message !== undefined && typeof message === "string") {
			console.log(message);
		} else {
			console.log("Usage: 'node clientonly --address 192.168.1.10 --port 8080 [--use-tls]'");
		}
		process.exit(code);
	}
Print a message to the console in case of errors
@param {string} message error message to print
@param {number} code error code for the exit call