Sorry if I am asking this question that has been already asked, but I am kind of a noob at programming, I tried researching how to fix this bug but I am still having trouble trying to solve it. I am trying to compile this block of code here:

```
//Default constructor
public Game () {
    potAmount = 100;
    betAmount = 0;
}

public int getBetFromUser() {
    //Introduction to the game
    System.out.println("Welcome to Solitaire Dice Game..bet an amount\r\n" + 
            "\t-if you roll triples you win triple your bet,\r\n" + 
            "\t-if you roll doubles you win double your bet,\r\n" + 
            "\t-if you roll 10 or over, you keep your bet\r\n" + 
            "\t-otherwise you lose your bet\r\n" + 
            "A bet of 0 ends the game\r\n");
    System.out.println("Your current pot is 100");
    System.out.println("Enter your bet amount:");
    betAmount = keyboard.nextInt();

    return betAmount;

```

And I am trying to call it in my main class but I get this compile error:

Enter your bet amount:

Exception in thread "main" java.lang.NullPointerException
 at Game.getBetFromUser(Game.java:26)
 at Assign3.main(Assign3.java:9)