运行的Yolov7一直出现这个bug

Traceback (most recent call last):
File "E:\虚拟机\YOLOV7\yolov7\train.py", line 616, in
train(hyp, opt, device, tb_writer)
File "E:\虚拟机\YOLOV7\yolov7\train.py", line 79, in train
names = ['item'] if opt.single_cls and len(data_dict['names']) != 1 else data_dict['names'] # class names
KeyError: 'names'

data_dict没有names这个键，你看看这个词典定义的时候，有没有定义names这个项目