   ERROR │ The director raised an exception.
────────────────────────────────── Traceback ───────────────────────────────────
Traceback (most recent call last):
  File "${PWD}/stepup/core/director.py", line ---, in async_main
    serve_result = await serve(
                 File "${PWD}/stepup/core/director.py", line ---, in serve
    _check_plan()
  File "${PWD}/stepup/core/director.py", line ---, in _check_plan
    raise ValueError(f"First line of plan differs from '{shebang}': {PLAN_PY}")
ValueError: First line of plan differs from '#!/usr/bin/env python3': plan.py
────────────────────────────────────────────────────────────────────────────────
DIRECTOR │ See you!
