Pagination links appearing null after applying Custom Pagination in django rest framework

Question

I used custom pagination as mentioned in Django rest framework. In that, I had to use my project name to give the path to CustomPagination, but every time it says module not found.

Then I manually import the pagination file in my views. It did work but my pagination links are appearing null. I have posted the picture here below.

My views:

from .pagination import CustomPagination

class ProductAPIView(ListAPIView):
    permission_classes = [AllowAny]
    queryset = Product.objects.all()
    serializer_class = ProductSerializer    
    filterset_class = ProductFilter
    pagination_class = CustomPagination

My pagination.py file

class CustomPagination(PageNumberPagination):
    def get_paginated_response(self, data):
        return Response({
            'links': {
                'next': self.get_next_link(),
                'previous': self.get_previous_link()
            },
            'count': self.page.paginator.count,
            'results': data
        })

My settings file:

 # 'DEFAULT_PAGINATION_CLASS': 'RupseOnline.core.pagination.CustomPagination',
    'PAGE_SIZE': 100,

I have commented out the pagination class and imported it manually in views because it says module not found.