I've solved it.
In case anyone has the same problem, I think it's because
'created_date' is set to auto_now, which means it's not editable and
should be in fieldsets

This link was helpful:
http://www.nabble.com/-Django-Code---7993:-Admin-complains-about-a-missing-field-even-if-it-is-not-missing-td18680119.html

Thanks for the suggestions
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