Error: "detail": "Authentication credentials were not provided."

Hello comunity, I am Denis I have a problem:

When i want to get into information in postman, This sends me the next error: “detail”: "Authentication credentials were not provided."

Attach:
The code in Django

Settings.py in (A) that shows the REST_FRAMEWORK,
Views.py in (B1 and B2) that indicates the code POST and
Postman¨s application (C)
Thanks them so much