Backfill problem with [fs-bq-import-collection] extension

[tom-mother-dev]

Hi,

I have problems running the backfill script.https://github.com/firebase/extensions/blob/master/firestore-bigquery-export/guides/IMPORT_EXISTING_DOCUMENTS.md
It starts with this one, altough I created a credentials file via this command (gcloud auth application-default login):
{"severity":"WARNING","message":"Warning, FIREBASE_CONFIG and GCLOUD_PROJECT environment variables are missing. Initializing firebase-admin will fail"}

When I continue following the steps from the tutorial and code gets run, I get following errors:
... {"severity":"WARNING","message":"No valid table reference is available. Skipping partitioning"} {"severity":"WARNING","message":"Cannot partition an existing table XYZ"} ... {"severity":"INFO","message":"Retried to insert 300 row(s) of data into BigQuery (ignoring unknown columns)"} {"severity":"INFO","message":"Inserting 300 row(s) of data into BigQuery"} {"severity":"WARNING","message":"Error when inserting data to table."}

Does someone know what I can do to fix this?

Kind regards,
Tom

[tom-mother-dev]

Is there someone who has any idea what I should do to make it work?
Thx, Tom