CommandError: Werkzeug is required to use runserver_plus.

[john1625b]

I ran all the previous commands:
./scripts/start-container # starts a local terminal for local development
./scripts/migrate
./scripts/seed # if you want to seed the database from fixtures

But ./scripts/start-app throws the error in the title.

I ran pip install Werkzeug to install. And for a second time to make sure and it said: Requirement already satisfied:

Any help appreciated, thanks