Error pulling stackgres/operator:master-jvm in a GCP Kubernetes cluster

After running kubectl apply -f https://gitlab.com/stackgres/stackgres/raw/master/example/kubernetes.yaml (master is at 51f4c085), I see the following:

$ kubectl get pod -nstackgres
NAME                                  READY   STATUS         RESTARTS   AGE
stackgres-operator-7cf748547b-9fbb9   0/1     ErrImagePull   0          5s

Screenshot

Cluster info:

Screenshot-2