Installation and project Python

project Python ... does not match

Run m3 setup from the project root. It installs the SDK version matching the standalone CLI into the selected isolated environment. If M3 selected the wrong environment, pass --python PATH to setup and doctor.

Setup selects an active VIRTUAL_ENV or CONDA_PREFIX before a project .venv. An active conda base is rejected with active Conda base is not a project environment; create or activate a project environment. Activate a project environment, deactivate base, or pass --python PATH.

Missing pytest, SQLite, or judge support

Run m3 setup. A direct SDK installation needs the applicable extras, such as sf-m3[pytest,storage,judge].

Refusing to install into a global Python

Create or activate an isolated environment, then rerun setup. M3 refuses to modify a system/global Python.

m3.toml is not a valid M3 project identity

m3 init found an m3.toml it cannot read as schema_version = 1 with a UUID project_id and a project_name. Restore the file from Git; creating a new one gives the project a new identity, and earlier runs and uploads no longer match it.