Hmm, I don't know enough to give you a confident answer yet. The information extracts provided do not contain specific details about the error you're encountering with Airbyte 0.50.8 on GKE. However, based on the error message, it seems like a permissions issue with the service account configured for your Kubernetes cluster. You might want to verify the permissions of your service account and ensure it has the necessary access rights. For more information on deploying Airbyte on Kubernetes, you can refer to the [official documentation](https://docs.airbyte.com/deploying-airbyte/on-kubernetes-via-helm).