Challenge Task 1 of 3 - Adding a set of tags to the Course Constructor

I am pretty sure that I completed the requirements of this task but it seems as if there is some other code that is being compiled with this file that has errors. And this particular code is initializing an instance of Course with only a String argument when it needs a String and a HashSet argument. This is the compiler error:

JavaTester.java:67: error: constructor Course in class Course cannot be applied to given types; Course course = new Course("Java Data Structures"); ^ required: String,HashSet found: String reason: actual and formal argument lists differ in length Note: JavaTester.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. 1 error

package com.example.model;

import java.util.List;
import java.util.HashSet;
import java.util.Set;

public class Course {
  private String mTitle;
  private Set<String> mTags;

  public Course(String title, HashSet<String> tags) {
    mTitle = title;
    mTags = tags;
  }

  public void addTag(String tag) {
    // TODO: add the tag
  }

  public void addTags(List<String> tags) {
    // TODO: add all the tags passed in
  }

  public boolean hasTag(String tag) {
    // TODO: Return whether or not the tag has been added
    return false;
  }

  public String getTitle() {
    return mTitle;
  }

}