Error from JavaTester; no difficulties locally

package com.teamtreehouse;

import java.io.IOException;

public class Main {

  public static void main(String[] args) throws IOException
  {
    String story = "Thanks __name__ for helping me out.  You are really a __adjective__ __noun__ and I owe you a __noun__.";

    Template tmpl = new Template(story);
    Prompter prompt = new Prompter();
    prompt.run(tmpl);
  }
}

package com.teamtreehouse;

import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;


public class Prompter {
    private BufferedReader mReader;
    private Set<String> mCensoredWords;

    public
    Prompter()
    {
        mReader = new BufferedReader(new InputStreamReader(System.in));
        loadCensoredWords();
    }

    private void
    loadCensoredWords()
    {
        mCensoredWords = new HashSet<>();
        Path file = Paths.get("resources", "censored_words.txt");
        List<String> words = null;
        try {words = Files.readAllLines(file);}
        catch (IOException e)
        {
            System.out.println("Couldn't load censored words");
            e.printStackTrace();
        }
      if(words != null){mCensoredWords.addAll(words);}
    }

    public void
    run(Template tmpl)
    {
      List<String> results;
      results = promptForWords(tmpl);
      System.out.printf("Your TreeStory:%n%n%s", tmpl.render(results));
    }

    /**
     * Prompts user for each of the blanks
     *
     * @param tmpl The compiled template
     * @return user responses to template prompts
     */
    public List<String>
    promptForWords(Template tmpl)
    {
        List<String> words = new ArrayList<>();
        for (String phrase : tmpl.getPlaceHolders())
        {
            String word = promptForWord(phrase);
            words.add(word);
        }
        return words;
    }


    /**
     * Prompts the user for the answer to the fill in the blank.  Value is guaranteed to be not in the censored words list.
     *
     * @param phrase The word that the user should be prompted.  eg: adjective, proper noun, name
     * @return What the user responded
     */
    public String
    promptForWord(String phrase)
    {
      String response = null;
      do
      {
        System.out.printf("%s: ",phrase);
        try{response = mReader.readLine();}catch(IOException e)
        {
          System.out.println("There was a problem prompting for a word");
          e.printStackTrace();
          System.exit(0);
        }

      }while(response.isEmpty() && mCensoredWords.contains(response));
      return response;
    }
}