pyspark error when running a python model in athena

Hey i am a user of dbt core with amazon athena as a db

I am trying to run a python model in dbt and run into a pyspark error.
The code I am trying to run is really simple (for debugging) , just pointing a ref and trying to return the same dataframe and create a new table with it.

def model(dbt, session):
    df = dbt.ref("dim_users")
    return df

The error I am getting is:

Possibly unquoted identifier dwh-stagingdb detected. Please consider quoting it with back-quotes as dwh-stagingdb(line 1, pos 3)

Anyone can please assist ?