Django : unknown application

I want to dump my data from the model of my app in Django.

So I tr开发者_C百科ied the following python manage.py dumpdata app > temp_data.json (from this answer)

where "app" is an app I created via python manage.py startapp app

It throws me the following error :

Error: Unknown application: asset

Can someone help me to figure out what's going on ?

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Is the app listed in your settings.py in INSTALLED_APPS?