E-IE0100 — Internal invariant violated in the Python frontend

Error Type	Internal Error
Phase	any
Python exception	`RuntimeError` (builtin)

Message

Internal error: {context}.

This is a bug in JijModeling - please report it to the developers in community Discord (https://discord.gg/Km5dKF9JjG) with the full error output.

({context} identifies the internal check that failed; include it verbatim in your bug report)

Cause

An internal invariant was violated while handling a Python API call. This error is not caused by a mistake in your model or inputs; no model built through the public Python API should be able to trigger it.

Fix

This is a bug in JijModeling, not in your code. Please report it at the JijModeling community on Discord together with the full error output — the {context} part identifies the failing internal check — and, if possible, a minimal script that reproduces it.