public static void main(String[] args){
		try {
			_port = initParser(args);
			Thread list = new Thread(new ListServer());
			Thread upload = new Thread(new UploadServer());
			list.start();
			upload.start();
			list.join();
			upload.join();
		} catch (NumberFormatException e) {
			System.err.println(Errors.INVALID_INITIALIZERS);
			System.exit(-1);
			
		} catch (SocketException e) {
			System.err.println(Errors.SOCKET_PROBLEM);
			System.exit(-1);
			
		} catch (IOException e) {
			System.err.println(Errors.IO_PROBLEM);
			System.exit(-1);
			
		} catch (Exception e) {
			System.err.println(Errors.UNKNOWN_ERROR);
			System.exit(-1);
		}
	}