fix 500 error

finance/views.py

@@ -19,8 +19,7 @@ from django.utils.html import strip_tags
 
 from courses.models import Course
 from courses.api import CourseParamsApi
-from finance.models import Bill, Invoice, 
+from finance.models import Bill, Invoice, InvoiceRebilling
-ebilling
 from finance.serializers import BillSerializer, InvoiceSerializer
 from finance.tasks import setup_periodic_billing
 from lms.global_decorators import transaction_decorator