title: Django - Value error when adding app name in 'INSTALLED APPS'
body: <p>When i add my app name in INSTALLED APPS inside settings.py file, i got the following error and its removed when i erase my app name from settings. What is the problem here?</p>
  
  <pre><code>Unhandled exception in thread started by &lt;function check_errors. 
  &lt;locals&gt;.wrapper at 0x0000007BFA7BB598&gt;
  Traceback (most recent call last):
  File "C:\Users\postgres\AppData\Local\Programs\Python\Python36\lib\site- 
  packages\django\utils\autoreload.py", line 227, in wrapper
  fn(*args, **kwargs)
  File "C:\Users\postgres\AppData\Local\Programs\Python\Python36\lib\site- 
  packages\django\core\management\commands\runserver.py", line 117, in 
  inner_run autoreload.raise_last_exception()
  File "C:\Users\postgres\AppData\Local\Programs\Python\Python36\lib\site- 
  packages\django\utils\autoreload.py", line 250, in raise_last_exception
  six.reraise(*_exception)
  File "C:\Users\postgres\AppData\Local\Programs\Python\Python36\lib\site- 
  packages\django\utils\six.py", line 685, in reraise
  raise value.with_traceback(tb)
  File "C:\Users\postgres\AppData\Local\Programs\Python\Python36\lib\site- 
  packages\django\utils\autoreload.py", line 227, in wrapper
  fn(*args, **kwargs)
  File "C:\Users\postgres\AppData\Local\Programs\Python\Python36\lib\site- 
  packages\django\__init__.py", line 27, in setup
  apps.populate(settings.INSTALLED_APPS)
  File "C:\Users\postgres\AppData\Local\Programs\Python\Python36\lib\site- 
  packages\django\apps\registry.py", line 108, in populate
  app_config.import_models()
  File "C:\Users\postgres\AppData\Local\Programs\Python\Python36\lib\site- 
  packages\django\apps\config.py", line 202, in import_models
  self.models_module = import_module(models_module_name)
  
  return _bootstrap._gcd_import(name[level:], package, level)
  File "&lt;frozen importlib._bootstrap&gt;", line 994, in _gcd_import
  File "&lt;frozen importlib._bootstrap&gt;", line 971, in _find_and_load
  File "&lt;frozen importlib._bootstrap&gt;", line 955, in _find_and_load_unlocked
  File "&lt;frozen importlib._bootstrap&gt;", line 665, in _load_unlocked
  File "&lt;frozen importlib._bootstrap_external&gt;", line 674, in exec_module
  File "&lt;frozen importlib._bootstrap_external&gt;", line 781, in get_code
  File "&lt;frozen importlib._bootstrap_external&gt;", line 741, in source_to_code
  File "&lt;frozen importlib._bootstrap&gt;", line 219, in _call_with_frames_removed
  ValueError: source code string cannot contain null bytes
  </code></pre>