Pack testing with config.schema.yaml

[Preranareddya]

I am currently performing pack testing. In base.py file in the actions directory we call the config.schema.yaml file. But when testing this action I am seeing the following error
actions/lib/base.py line 8 in init
self.api_url = config['api_url']
TypeError: 'NoneType' object is not subscriptable
Can someone help me with this?
Has anyone seen a similar issue?