18:28:49 + docker pull dockerbuildbot/docker-py:py3-7750c91f1652e4fb536243e0819fd8b1e4c371be 18:28:49 Error response from daemon: manifest for dockerbuildbot/docker-py:py3-7750c91f1652e4fb536243e0819fd8b1e4c371be not found: manifest unknown: manifest unknown