Tag latest not found when pulling Docker image

I started getting the error below last night and persists through today. I’ve verifed that the latest tag indeed exists on the Docker hub, and if I ssh into the build instance on CircleCI I can do docker pull boot2docker/boot2docker fine without issue.

de238ad49312: 465fd001a8e2: Pulling repository docker.io/boot2docker/boot2docker
Tag latest not found in repository docker.io/boot2docker/boot2docker

Currently my builds continue to fail when this happens.

same here.
pulling the same image in any other machine is working.