Python 3.6 Django 1.11 manage.py" (I'm unable to add apps)

[Eljo]

What's wrong? can someone help me?

In the settings.py (INSTALLED_APPS) I'm unable to add apps.!!

C:\Users\Administrator\PycharmProjects\website>python manage.py makemigrations
Traceback (most recent call last):

File "manage.py", line 22, in <module>

execute_from_command_line(sys.argv)

File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\core\management\init.py", line 363, in execute_from_command_line

utility.execute()

File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\core\management\init.py", line 337, in execute

django.setup()

File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\init.py", line 27, in setup

apps.populate(settings.INSTALLED_APPS)

File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\apps\registry.py", line 85, in populate

app_config = AppConfig.create(entry)

File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\apps\config.py", line 120, in create

mod = import_module(mod_path)

File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\importlib\init.py", line 126, in import_module

return _bootstrap._gcd_import(name[level:], package, level)

File "<frozen importlib._bootstrap>", line 978, in _gcd_import
File "<frozen importlib._bootstrap>", line 961, in _find_and_load
File "<frozen importlib._bootstrap>", line 936, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed
File "<frozen importlib._bootstrap>", line 978, in _gcd_import
File "<frozen importlib._bootstrap>", line 961, in _find_and_load
File "<frozen importlib._bootstrap>", line 948, in _find_and_load_unlocked

ModuleNotFoundError: No module named 'rest_frameworkcompanies'