Value 'debug GraphQL source'

After following the getting started guide for integrating my android application with AWS from https://aws.amazon.com/blogs/mobile/building-an-android-app-with-aws-amplify-part-1/
, the build of my app is now failing with issues " ERROR: Value 'debug GraphQL source' specified for property '$2' cannot be converted to a file."

Environment
Appsync SDK version 2.6.+
gradle version 5.4.1
android studio 3.5

I have installed AWS amplify CLI and configured it accordingly.
After following the above tutorial I am stuck with this . Kindly consider my issue and revert back as soon as possible.