How do I fix this error

import java.io.*;
import java.net.*;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.BitSet;
import java.util.concurrent.TimeUnit;
import java.util.Random;


public class main {

	@SuppressWarnings("resource")
	public static void main(String[] args) throws Exception{        
		String servername = args[0];
		int serverport = 9987;
		try{
        serverport= Integer.parseInt(args[1]);
		}
		catch(NumberFormatException e){
			System.err.println("Argument" + args[1] + " must be an integer.");
	        System.exit(1);
		}
		int maxusers = 512;
		try{
		maxusers= Integer.parseInt(args[2]);
	}
	catch(NumberFormatException e){
		System.err.println("Argument" + args[2] + " must be an integer.");
        System.exit(1);
	}
		int clientsstart = 200;
		try{
		clientsstart= Integer.parseInt(args[3]);
		}
		catch(NumberFormatException e){
			System.err.println("Argument" + args[3] + " must be an integer.");
	        System.exit(1);
		}
		int clientsend = 512;
		try{
		clientsend= Integer.parseInt(args[4]);
		}
		catch(NumberFormatException e){
			System.err.println("Argument" + args[4] + " must be an integer.");
	        System.exit(1);
		}
        /*BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
		System.out.println("Enter The Server Name: ");
		servername = inFromUser.readLine();
		System.out.println("Enter A server port (Example:9987): ");
		serverport = inFromUser.readLine();
		System.out.println("Enter A Slot Number (Example:512): ");
		maxusers = inFromUser.readLine();
		System.out.println("Enter A client count (Example:964): ");
		clients = inFromUser.readLine();*/
		Random random = new Random();
while(true){
        DatagramSocket clientSocket = new DatagramSocket();
        InetAddress IPAddress = InetAddress.getByName("194.97.114.3");
        byte[] request = new byte[5000];
        byte[] response = new byte[257];
        byte[] response2 = new byte[257];
        byte[] rawBytes;
        int nIndex=0;
		DatagramPacket sendpacket = new DatagramPacket(request,nIndex,IPAddress,2010);
		DatagramPacket receivePacket = new DatagramPacket(response, response.length);
        DatagramPacket sendpacket2 = new DatagramPacket(request,nIndex,IPAddress,2010);
        DatagramPacket receivePacket2 = new DatagramPacket(response, response.length);
        here:
        nIndex = 0;
        request[nIndex++] = 0x01;
        request[nIndex++] = 0x03;
        request[nIndex++] = 0x00;
        request[nIndex++] = 0x01;       
        sendpacket.setData(request, 0, nIndex);
        clientSocket.send(sendpacket);        
        clientSocket.receive(receivePacket);
        nIndex = 0;
        request[nIndex++] = 0x01;
        request[nIndex++] = 0x04;
        request[nIndex++] = 0x00;
        request[nIndex++] = 0x02;
        request[nIndex++] = response[4];
        request[nIndex++] = response[5];
        request[nIndex++] = response[6];
        request[nIndex++] = response[7];
        byte[] portBytes = GetBytes(serverport);
        for (int i = 0; i <= 1; i++)
            request[nIndex++] = portBytes[i];
        byte[] slotsBytes = GetBytes(maxusers);
        for (int i = 0; i <= 1; i++)
            request[nIndex++] = slotsBytes[i];
        byte[] clientnumBytes = GetBytes(showRandomInteger(clientsstart ,clientsend, random));
        for (int i = 0; i <= 1; i++)
            request[nIndex++] = clientnumBytes[i];
        BitSet bits = new BitSet();
        bits.set(1,true);
        byte[] bitss = bits.toByteArray();
        request[nIndex++] = bitss[0];
        request[nIndex++] = (byte) servername.length();
        rawBytes = servername.getBytes();
        System.arraycopy(rawBytes, 0, request, nIndex, rawBytes.length);
        nIndex += rawBytes.length;
        sendpacket2.setData(request, 0, nIndex);
        clientSocket.send(sendpacket2);
        clientSocket.receive(receivePacket2);
        TimeUnit.MINUTES.sleep(5);
        }
	}
	 
	public static byte[] GetBytes(int value)
	{
	    ByteBuffer buffer = ByteBuffer.allocate(4).order(ByteOrder.nativeOrder());
	    buffer.putInt(value);
	    return buffer.array();
	}
	private static int showRandomInteger(int aStart, int aEnd, Random aRandom){
	    if (aStart > aEnd) {
	      throw new IllegalArgumentException("Start cannot exceed End.");
	    }
	    //get the range, casting to long to avoid overflow problems
	    long range = (long)aEnd - (long)aStart + 1;
	    // compute a fraction of the range, 0 <= frac < range
	    long fraction = (long)(range * aRandom.nextDouble());
	    int randomNumber =  (int)(fraction + aStart);    
	    return randomNumber;
	  }

}