Java Codekata 1 program absolute begineer

I am having difficulty regarding the 1 problem even though i m getting the output as the sample shown. My submission is showing an error.

Please help me solve the error.

This is the question:

Print the First 3 multiples of the given number "N". (N is a positive integer)

Note: print the characters with a single space between them.

Input Description:
A positive integer is provided to you as an input.

Output Description:
Print the First 3 multiples of the number with single spaces between them as an output.

Sample Input :
2

Sample Output :
2 4 6

This is the code i have provided :

import java.util.Scanner;

public class Main

{

public static void main(String[] args)

{

Scanner obj = new Scanner(System.in);

int userInput = obj.nextInt();

//System.out.println("The Input Provided is: " + userInput);

int num;

if(userInput > 0)

{

for (int i =1; i < 4; i++)

{

num = userInput * i ;

System.out.print(num + " ");

}

}

}

}