Then this is where the error comes from. When I enter the editor, I see the following initial solution:

public class Kata {
  public static String subtractSum (int n) {
    //return fruit name like "apple"
  }
}

That's what you should complete, and not write your own main method :P

Edit: to make your code look nicer you can use https://docs.codewars.com/references/markdown/#code-block

What does your solution look like? Do you have a class called 'Kata' and method named 'subtractSum' inside it? (as the tests expect it)