Image Lab Error - ComfyUI Rejected The Workflow (Code 400, Node UnetLoaderGGUF not Found)

### What happened?

<img width="732" height="130" alt="Image" src="https://github.com/user-attachments/assets/3c5993ee-455f-46d2-b60f-be01f5a4a705" />

While attempting to use Flux Klein 9b q4 k m.

### Steps to reproduce

_No response_

### Relevant logs

```shell

```

### Version

2.16.1

### What Operating System are you using?

Windows