The error message is showing up in my billing export project: "Error loading location southamerica-west1: BigQuery Data Transfer Service does not yet support location: southamerica-west1". According to your documentation of "Regions and Zones" at https://cloud.google.com/compute/docs/regions-zones, the "southamerica-west1" does not exist.
I am not sure if it is related. All of my views in the SQL workspace in the same project can not be previewed. No results are displayed after my clicking the "Preview" tab.