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

# E0201 — ArtifactParse (backend)

> A hardware backend could not parse or resolve the artifact.

<Warning>E0201: backend could not parse artifact</Warning>

## What happened

A registered hardware backend attempted to load a `.thx` artifact and failed. The artifact JSON could not be parsed or the backend could not resolve its structure into a runnable model.

## Why

Possible causes:

* The artifact was compiled for a different target (e.g. `sim` artifact passed to a hardware backend that requires target-specific fields)
* The artifact is corrupt (see [E0008](/errors/E0008), [E0009](/errors/E0009))
* The backend implements an older API that does not support the current artifact format version

## How to fix

1. **Recompile for the correct target**: `thx.compile(model, "model.thx", target="loihi2")`.
2. **Verify the artifact is valid**: `thrindex doctor --check model.thx`.
3. **Check backend compatibility**: ensure the backend driver version matches the artifact format version.

## Example

```
E0201: backend could not parse artifact
Why: missing required field `loihi2_core_map` — artifact was not compiled for this target
Fix: verify the artifact was produced by `thrindex compile --target loihi2` and is not corrupted
Docs: https://docs.thrindex.com/errors/E0201
```