title: Django: 'LeagueAdmin.inlines' must be a list or tuple
body: <p>Here is my code:</p>
  <pre><code>from League.models import Leagues
  from League.models import Team
  from django.contrib import admin
  
  class TeamsInLeague(admin.StackedInline):
      model = Team
      extra = 1
  
  class LeagueAdmin(admin.ModelAdmin):
      fields = ['LeagueName']
      inlines = TeamsInLeague
  
  admin.site.register(Leagues,LeagueAdmin)
  </code></pre>
  <p>it gives me the error:</p>
  <pre><code>'LeagueAdmin.inlines' must be a list or tuple.
  </code></pre>
  <p>It works fine when I remove <code>inlines = TeamsInLeague</code></p>
  <p>I am following the tutorial, not to the word, but trying to solve my own problem.</p>