# KERNEL_V2_DONCHIAN

A Donchian edge cannot run on the engine the execution settings select.

## What happened

Donchian edges run only on Forge's classic engine, and this run's execution settings force the newer one. Before a run starts, the engine settles every setting it depends on, and a setting that cannot be settled ends the run with this code without testing anything. The engine's own text is in `detail.reason`.

## What to do

Choose a different edge for this run, or leave the execution settings at their defaults.

## Example

```json
{
  "status": "failed",
  "error": {
    "code": "KERNEL_V2_DONCHIAN",
    "message": "The engine refused this run's settings before it started.",
    "detail": {}
  }
}
```

The reply also carries `detail.reason`, left out of this sample.