title: Django app not found despite adding to INSTALLED_APPS?
body: <p>its just a sample app,</p>
  
  <p>app name:wiki</p>
  
  <pre><code>#models.py
  
  from django.db import models
  
  class Page(models.Model):
  name = models.CharField(max_length=20, primary_key=True)
  content = models.TextField(blank=True)
  
  #settings.py
  
  INSTALLED_APPS = [
  'django.contrib.admin',
  'django.contrib.auth',
  'django.contrib.contenttypes',
  'django.contrib.sessions',
  'django.contrib.messages',
  'django.contrib.staticfiles',
  'wiki.apps.WikiConfig',
  'wikicamp.wiki',
  'wiki',
  ]
  </code></pre>
  
  <p>(i tried all the possible links/address of the app i.e wiki, and even individually too) </p>
  
  <p>and it still show the following error on running:
  <strong>python3 manage.py makemigrations wiki</strong></p>
  
  <p>Error: <strong>App 'wiki' could not be found. Is it in INSTALLED_APPS?</strong></p>