Custom error handler in DRF

error_handler.py

from rest_framework.views import exception_handler


def custom_exception_handler(exc, context):
    # Call REST framework's default exception handler first,
    # to get the standard error response.
    response = exception_handler(exc, context)

    if response is not None:
        # check if exception has dict items
        if hasattr(exc.detail, 'items'):
            # remove the initial value
            response.data = {}
            errors = []
            for key, value in exc.detail.items():
                # append errors into the list
                errors.append("{} : {}".format(key, " ".join(value)))
            
            # add property errors to the response
            response.data['errors'] = errors

        # serve status code in the response
        response.data['status_code'] = response.status_code

    return response

I did this in my project but when I try to define my settings it raises an error that No module named my_project.my_app