Error making fixtures

Hello, I'm tryng to do fixtures with dumpdata. I write this command: 

python manage.py dumpdata quests --indent=4 > quests/fixtures/quests_views_testdata.json

But I get this error message:

_mysql_exceptions.OperationalError: (1054, "Unknown column 'quests_quest.availability' in 'field list'")

--
Thanks,

Rubén

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