@@ -0,0 +1,205 @@
+from rest_framework import serializers%0A%0Afrom .models import ShortURL%0A%0A%0Aclass ShortURLSerializer(serializers.ModelSerializer):%0A    class Meta:%0A        model = ShortURL%0A        fields = %5B'url', 'short_url'%5D%0A

Add ShortURLSerializer to shortener/serializers.py