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Changes between Initial Version and Version 1 of Ticket #31221, comment 1

initial	v1
1	1	Did you make sure to add `django.contrib.postgres` to your `INSTALLED_APPS` [https://docs.djangoproject.com/en/3.0/ref/contrib/postgres/fields/#hstorefield as documented]?
2	2
3		The latter is in charge of [https://github.com/django/django/blob/b9cf764be62e77b4777b3a75ec256f6209a57671/django/contrib/postgres/apps.py#L11-L28 connecting a signal receiver] that [https://github.com/django/django/blob/b9cf764be62e77b4777b3a75ec256f6209a57671/django/contrib/postgres/signals.py#L37-L43 registers] the necessary `psycopg2` adapters on connection creation.
	3	The latter is in charge of [https://github.com/django/django/blob/b9cf764be62e77b4777b3a75ec256f6209a57671/django/contrib/postgres/apps.py#L11-L28 connecting a signal receiver] that [https://github.com/django/django/blob/b9cf764be62e77b4777b3a75ec256f6209a57671/django/contrib/postgres/signals.py#L37-L43 registers] the necessary `psycopg2` adapters on connection creation that [https://www.psycopg.org/docs/extras.html#hstore-data-type turns the string provided by PostgreSQL into a Python dict].
4	4
5	5	If that's the origin of your issue I suggest we re-purpose this ticket to add system checks to all `django.contrib.postgres.fields` that errors when a field is used but `self.model._meta.apps.get('postgres')` is missing.