ImagePullBackoff for Task Runner

Job #1475312187 failed for 710eb5b7:

NAME                                                              READY   STATUS             RESTARTS   AGE
review-337545-fol-04r2dl-gitaly-0                                 1/1     Running            0          20m
review-337545-fol-04r2dl-gitlab-runner-86b45dc67d-q4d7c           1/1     Running            0          20m
review-337545-fol-04r2dl-gitlab-shell-69f56c9879-2prvx            1/1     Running            0          19m
review-337545-fol-04r2dl-gitlab-shell-69f56c9879-bps5l            1/1     Running            0          20m
review-337545-fol-04r2dl-migrations-1-7xnss                       0/1     Completed          0          20m
review-337545-fol-04r2dl-minio-6d949db5d-2m2tm                    1/1     Running            0          20m
review-337545-fol-04r2dl-minio-create-buckets-1-jkr8p             0/1     Completed          0          20m
review-337545-fol-04r2dl-nginx-ingress-controller-65c76958l6hzd   1/1     Running            0          20m
review-337545-fol-04r2dl-nginx-ingress-controller-65c76958zs2c4   1/1     Running            0          20m
review-337545-fol-04r2dl-nginx-ingress-default-backend-79bfg6t8   1/1     Running            0          20m
review-337545-fol-04r2dl-postgresql-0                             1/1     Running            0          20m
review-337545-fol-04r2dl-redis-master-0                           1/1     Running            0          20m
review-337545-fol-04r2dl-registry-555d668b9b-l7f8b                1/1     Running            0          20m
review-337545-fol-04r2dl-sidekiq-all-in-1-v1-f899b989d-wnczm      1/1     Running            0          20m
review-337545-fol-04r2dl-task-runner-69596c6b75-bnrjd             0/1     ImagePullBackOff   0          20m
review-337545-fol-04r2dl-webservice-default-7dcd5f95f5-vz7k8      2/2     Running            0          20m
review-337545-fol-04r2dl-webservice-default-7dcd5f95f5-w9lq9      2/2     Running            0          20m