Problem with Eclipse Neon

I have a script to ask myself words. I hit the Design button in Eclipse and this happens to me- link .

Show Stack Trace: link link link link link

This is the script:

import java.util.Scanner;
public class WoordjesLeren {

    public static void main(String[] args) {
        Scanner wordL= new Scanner(System.in);
        Scanner wordR = new Scanner(System.in);
        Scanner answer= new Scanner(System.in);


        System.out.println("Word:");    
        String wordL1= wordL.nextLine();
        System.out.println("Translation:"); 

        String wordR1= wordR.nextLine();

        System.out.println("Word:");    
        String wordL2= wordL.nextLine();
        System.out.println("Translation:"); 

        String wordR2= wordR.nextLine();

        System.out.println("Word:");    
        String wordL3= wordL.nextLine();
        System.out.println("Translation:"); 

        String wordR3= wordR.nextLine();

        System.out.println("Word:");    
        String wordL4= wordL.nextLine();
        System.out.println("Translation:"); 

        String wordR4= wordR.nextLine();

        System.out.println(wordL2 + " -> ");

        String answer2= answer.nextLine();
        if (answer2.equals(wordR2)){
            System.out.println("Your answer is correct.");

        }else{
            System.out.println("Your answer is incorrect.");
        }
        System.out.println(wordL3 + " -> ");

        String answer3= answer.nextLine();
        if (answer3.equals(wordR3)){
            System.out.println("Your answer is correct.");
        }else{
            System.out.println("Your answer is incorrect.");
        }
        System.out.println(wordL4 + " -> ");

        String answer4= answer.nextLine();
        if (answer4.equals(wordR4)){
            System.out.println("Your answer is correct.");
        }else{
            System.out.println("Your answer is incorrect.");
        }
        System.out.println(wordL1 + " -> ");

        String answer1= answer.nextLine();
        if (answer1.equals(wordR1)){
            System.out.println("Your answer is correct.");
        }else{
            System.out.println("Your answer is incorrect.");
        }

        System.out.println("This was the exam, well done.");
    }
}