I keep getting this same error message, about my break being outside the switch or loop

I am so lost and I am confused about where to put my break in my code to loop back to the start. I have been working on this for seven hours and have had no luck in trying to figure it out. I have checked other online resources and my text but nothing is working. I have it at the end but that just causes an error.

import java.util.Random;
import java.util.Scanner;

public class guess
{
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int guessednum;
System.out.print("Welcome to 'Guess That Number!!!!' ");
System.out.println("\nPlease enter a positive number to begin! :");
    int n = scan.nextInt();
        System.out.println("Enter the maximum amount of guesses you would like to     make during this game: ");
    int numguess = scan.nextInt();
Random r = new Random();
guessednum = r.nextInt(n)+1;
Scanner keyboard = new Scanner(System.in);
int g;
int t = 0;
System.out.println("Kindly think of a number within 1 and "+n);
System.out.println();
 do {
t++;
System.out.print("What do you think the number is? ");
g = keyboard.nextInt();
if (g == guessednum)
System.out.println("correct");
else if (g < guessednum)
System.out.println("the number is higher");
else if (g > guessednum)
System.out.println("the number is lower");
} while (g != guessednum && t < numguess);
if (g != guessednum)

System.out.println("You lost!");

System.out.println("\nEnter 1 to try again or 0 to exit:");
    int a;
    a= scan.nextInt();
    if(a==0)
break;

}
}