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/E510.md.
mfeflow

    MFEFLOW_E510

    Another deploy changed the index at the same time.

    Fix

    Run mfeflow status to see what is served now, then run the command again. The index was not changed by this run. See https://mfeflow.github.io/mfeflow/guide/deploy-and-rollback.