[Python] AttributeError: 'AAttn' object has no attribute 'qkv' when running inference on...

I'm currently trying to run inference using my YOLOv12 model, but I encountered the following error:

AttributeError: 'AAttn' object has no attribute 'qkv'

this is my code:

from ultralytics import YOLO

model = YOLO(r"D:\a\b\Model\newDatasetVersion\12\m\best.pt")

img = r"D:\a\br\Program\Scrapping\Frames_Kopo\Kopo0_20250228_111522_frame_1.jpg"
results = model(img, save=False)


I'm not entirely sure what's causing this. Here's a bit of context:

• I'm using YOLOv12 (custom-trained).
• The error occurs during inference, not training.

I tried loading my YOLOv12 model and running inference on an image. I expected the model to return predictions (bounding boxes, classes, etc.) as usual. However, instead of getting the output, I got that error.

I didn’t modify the model architecture manually, just trained my custom dataset with yolo12m.pt, so I’m not sure why this is happening. I expected the inference to run normally as it did previously.

What might be causing this or how can I fix it?

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