ImproperlyConfigured: 'SentAdmin.fields' refers to field 'dateSent' that is missing from the form.

I was changing models many times and deleting tables inbetween.
New tables were generated to improved models and admin site worked
perfectly.
Now smth happened that i am getting error:

ImproperlyConfigured: 'SentAdmin.fields' refers to field 'dateSent'
that is missing from the form.

'dateSent' is in the model and correctly described in admin.py

I did not added this field before generating new tables. It was
previously.
If i comment other fields gives the same error.

What can be the solution?
Should i make new project or there is a way to update forms (for
field 'dateSent' and orher fields that are missing from the form
according Django) ??

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