How to solve this probem Exception in thread "main" java.lang.NullPointerException at Test.main(Test.java:342)

public static void main(String[] args){
    Scanner scanner = new Scanner(System.in);
    
    System.out.print("Enter member id to search : "); 
    String search = scanner.nextLine();
    for (int i = 0; i < v.length; i++) {
        if (search.equals(v[i].getMemID())) { // String comparison 
            System.out.println(v[i].toString());
            System.out.print("Enter your Name");							
            String memName = scanner.nextLine();
            v[i].setmemName(memName);
        } 
    }
}