> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ctrlrun.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# InvalidArgument

> An argument cannot be accepted as given.

`ctrlrun.InvalidArgument` — class, defined at `src/ctrlrun/errors.py:8`

```python theme={null}
class InvalidArgument(CTRLRunError)
```

An argument cannot be accepted as given.

An Action field or argument that cannot be canonicalized (SPEC-v0.1 §2.3), and — the
same kind of wiring bug — a StateStore transition no record can make, such as committing
an effect nobody reserved.

## Next

* [Python API index](/reference/api/index).
* [Get started](/get-started/quickstart) · [Why](/why).


## Related topics

- [Errors](/reference/errors.md)
- [Reconcile automatically](/guides/reconcile-automatically.md)
- [Use the LangGraph adapter](/guides/langgraph-adapter.md)
- [SchemaMismatch](/reference/api/SchemaMismatch.md)
- [The Agent Control Standard](/ACS.md)