Error when deploying microservices to GKE cluster

[hsbowling17]

I followed the instructions up until the "Deploy all microservices to GKE cluster:" section, and now I am receiving the following error messages:

- deployment/authentication: container authentication is waiting to start: <img-ref> can't be pulled
- pod/authentication-7759fc6d4-67fgt: container authentication is waiting to start: <img-ref> can't be pulled
- deployment/authentication failed. Error: container authentication is waiting to start: <img-ref> can't be pulled.
1/1 deployment(s) failed
Error occurs when running command: PROJECT_ID=<project-id> skaffold run -p default-deploy -n default --default-repo="gcr.io/<project-id>" (working_dir=.)

This specifically occurs when running sb deploy -n $NAMESPACE. For reference, I did not set up a jump host as it is an optional step.