Custom error messages in Django Rest Framework

I have a serializer:

Custom error messages in Django Rest Framework

I have a serializer:

Custom error messages in Django Rest Framework

I have a serializer:

Custom error messages in Django Rest Framework

I have a serializer:

Custom error messages in Django Rest Framework

I have a serializer:

Custom error messages in Django Rest Framework

I have a serializer:

Custom error messages in Django Rest Framework

I have a serializer: