Null pointer exception when adding team to list of teams: Soccer League Organizer

Can anyone see why there is a null pointer exception? Here is what happens:

Select an option: create
What is the team name: iouou
What is the coach name: team coach
Exception in thread "main" java.lang.NullPointerException
at com.teamtreehouse.LeagueView.run(LeagueView.java:69)
at LeagueManager.main(LeagueManager.java:15)

```public class LeagueView {

private BufferedReader mReader; private int count; private int index; //private Players players; private Player[] players;

private Map<String, String> mMenu; private Team mTeam; private Teams mTeams;

public LeagueView(Player[] players){ this.players = players;

```         case "create":
              mTeam = promptNewTeam();
              mTeams.addTeam(mTeam);
            System.out.printf("The team %s has been created with %s as coach. %n%n", mTeam.getTeamName(), mTeam.getCoachName());
            break;```

Line 69: mTeams.addTeam(mTeam);
Lines 14 and 15 from LeagueManager:
 LeagueView view = new LeagueView(players);
    view.run();