AssertionError: renderer returned unicode, and did not specify a charset value.

[ukanga]

https://sentry.onalabs.org/ona/onadata/issues/72502/

AssertionError: renderer returned unicode, and did not specify a charset value.
  File "rest_framework/response.py", line 75, in rendered_content
    'renderer returned unicode, and did not specify '

AssertionError: renderer returned unicode, and did not specify a charset value.

This exception is raised when a user is pulling a form that includes a linked dataset that they do not have permission to. The MediaFileRenderer has charset=None when the response being generated is a JSON string with '{"details": "You don't have permission"}'.

Aha! Link: https://ona.aha.io/features/PROD-259