For AI agents: the complete documentation index is available at https://mfeflow.github.io/mfeflow/llms.txt, the full documentation bundle is available at https://mfeflow.github.io/mfeflow/llms-full.txt, and this page is available as Markdown at https://mfeflow.github.io/mfeflow/errors/E508.md.
mfeflow

    MFEFLOW_E508

    There is no such version to move to.

    Fix

    Run mfeflow status to see what each environment serves and the versions you can go back to. See https://mfeflow.github.io/mfeflow/guide/deploy-and-rollback.