So you have a post-start script that is failing. You would need to fix this and Apply Changes again.
To understand what's failing, you would need to `bosh logs` and obtain the logs for the failing `pivotal-container-service` instance (you can grab the guid from that log). Alternatively, you could `bosh ssh` to the failing instance. Then look at the logs for the failing job, which is according to your screenshot `pks-api`.
Hope that helps!