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/E115.md.
mfeflow

    MFEFLOW_E115

    Two apps use the same port.

    Fix

    Give one of them another port in its rsbuild config and in "apps" in mfeflow.json.