Change mintproject/aquifer:v1 to mintproject/aquifer:latest in main_ERC.cwl to correspond with publicly available / existing Docker image version in DockerHub:
https://hub.docker.com/r/mintproject/aquifer/tags?page=1&ordering=last_updated
Here's this minor change on my GitHub fork:
dhardestylewis@266f54b#diff-b57f45b6a88e5d9c4d6a54a26e039725e0158d20a6e663a77b248e690450149b