Error when deploying microservices to GKE cluster

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