Problem with my training, Pytorch YOLOv3

[ahmed_mounim]

hello, please help me

1. Object detection with Pytorch YOLOv3 with 8 classes

2. I was able to download and load the file yolov3-spp-ultralytics.pt on yolov3/weight/… and it works with 1 classes

3. now I have another error when i’m trying to train with 8 classes

4. look at this picture

Thanks,