Java: EIngabe per Scanner wirft Exception

Exception in thread "main" java.util.NoSuchElementException

  at java.util.Scanner.throwFor(Scanner.java:862)

  at java.util.Scanner.next(Scanner.java:1371)

  at Input.inp(Input.java:13)

  at Input.main(Input.java:26)

import java.util.Scanner;

public class Input

{

  public static void prn(String txt){

    System.out.println(txt);}

  public static String inp(String hinw){

    System.out.print(hinw);

    Scanner sc = new Scanner(System.in); //öffnet das File "System.in";

    String s = sc.next(); //liest Alles ein, bis Return

    sc.close(); //schließt Scanner

    return s;

  }

  public static void main(String[] args){

    String erg;

    erg=inp("Vorname: ");

    prn(erg);

    erg=inp("Nachname: "); //<--- hier kracht es

    prn(erg);      

  }

}