Ollama + Chromadb + Oracle: when ask Vanna, it returns an ollama json error.

[gzjamesbond]

the environment is Ollama + ChromaDB + Oracle DB. I followed to document to install and setup. Everything looks fine. Oracle DB connnection is ok, as well as the cChromaDB. After I train vanna with DDL and SQL, when I ask it, it returns an ollama json error as below. Did I miss something during setup?

 raise ResponseError(e.response.text, e.response.status_code) from None
ollama._types.ResponseError: invalid format: expected "json" or a JSON schema