This error has been bugging me last time when I was installing Watson Studio on IBM Cloud Pak for Data, running on OCP 4.8.
Dependency CCS failed to install Unable to install CSS prerequisite
Apparently the reason is that one of the required service, IBM Common Core Service has not been installed correctly. One of the pods failed to pull the image due to pull secret issue with IBM Entitlement Key.
Please make sure that the secret has been propagated correctly to all worker nodes.
Somehow once it fails, it will be problematic.