"Pleae provide a service account credentials json file"

[LundinMachine]

In the Streamlit demo, I tried:
poetry run streamlit run app.py

I get the following error:
raise ValidationError("Pleae provide a service account credentials json file")
vanna.exceptions.ValidationError: Pleae provide a service account credentials json file

I have included a .env file with VANNA_API_KEY and GCP_PROJECT_ID key. It looks like an additional .json file is required?