```bash pipenv install Pipfile.lock (19a47c) out of date, updating to (718822)… Locking [dev-packages] dependencies… ✔ Success! Locking [packages] dependencies… ✔ Success! Updated Pipfile.lock (19a47c)! Installing dependencies from Pipfile.lock (19a47c)… An error occurred while installing -e .! Will try again. 🐍 ▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 24/24 — 00:00:06 Installing initially failed dependencies… [pipenv.exceptions.InstallError]: ['Obtaining file:///home/moul/projects/silkaj'] [pipenv.exceptions.InstallError]: ['ERROR: Error installing \'file:///home/moul/projects/silkaj\': editable mode is not supported for pyproject.toml-style projects. pip is processing this project as pyproject.toml-style because it has a pyproject.toml file. Since the project has a setup.py and the pyproject.toml has no "build-backend" key for the "build_system" value, you may pass --no-use-pep517 to opt out of pyproject.toml-style processing. See PEP 517 for details on pyproject.toml-style projects.'] ERROR: ERROR: Package installation failed... ``` Introduced in !76.