drf-yasg
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serializers.NullBooleanField has been removed in the latest DRF 3.14
serializers.NullBooleanField has been removed in the latest DRF 3.14 . It needs to be imported from rest_framework.fields.
https://github.com/JoelLefkowitz/drf-yasg/blob/7316f13497065ffbe0e134e2a4bbd4ea76939d2c/src/drf_yasg2/inspectors/field.py#L488