failed to find TLS certificate objects, no entry finder provided

I'm trying to setup TLS @ the Cluster Level on the backend connection to the Origin Endpoint. The front end between the client and the HTTP load balancer works fine, but when i attempt to configure TLS @ the cluster level for a route, i get this error:  failed to find TLS certificate objects, no entry finder provided when saving changes to the cluster in the gui. 

I'm quite certain i have the proper CA cert uploaded..and i've tried adding the trust chain into the same cert--both with or without the intermediate chain in the CA cert, i get the same error. Does anyone have any thoughts on what might be wrong here?