> 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.

# MFEFLOW_E215

The app name cannot be used.

## Fix

Use lowercase words of letters and digits joined by single underscores (order_history), starting with a letter, and a name no app has yet.