install.python_externally_managed

pip refuses to install into the system Python

A mevcore app hosting error at the “install and build” stage.

What it means

The system Python is marked as externally managed (PEP 668).

The error happened while installing dependencies or building the project. The new version was not started, the current one keeps running.

Typical causes

The install or build command exited with an error
Out of memory or disk space
The language or package manager version is not the one the project expects

How to fix it on mevcore

Install into a virtual environment (python -m venv .venv && .venv/bin/pip install -r requirements.txt) and start from it, or add --break-system-packages to the pip command in the settings.

1 Open the app in the mevcore panel: the Problems card on the overview shows this error and the log line it was found in.
It is fixed on the “Settings” tab of the app.
2 After the fix, deploy again. If it fails again, the log ends with [mevcore] lines naming the new error code.
3 The "Ask AI" button next to the error prepares a request for ChatGPT or Claude: the error code, the end of the log without secrets and the app settings.

For an AI assistant

The same in English: paste it together with the log into the AI chat.

mevcore error code: install.python_externally_managed
phase: install and build
diagnosis: pip refuses to install into the system Python
platform hint: The system Python is marked as externally managed (PEP 668). Install into a virtual environment (python -m venv .venv && .venv/bin/pip install -r requirements.txt) and start from it, or add --break-system-packages to the pip command in the settings.
platform docs: https://mevcore.com/llms-full.txt

Can't fix it?

Message support with the error code: we will tell you what to change in the project or settings.

App hosting