Hey folks,
It is likely that your projects were created before the introduction of Content Source Integrations (CSI) and were created using a stackbit.yaml file. Pre-CSI projects are no longer supported, and unfortunately, there’s no migration path to CSI available.
Your options are to either start the project from scratch, or provide us with the project ID so we can attempt to force CSI compatibility for you from our end. You can find the project ID here.