A problem during the training

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When I start the train_rcnn.py, I get the following error, can you tell me what the reason is：

File "train_rcnn.py", line 275, in lr_scheduler_each_iter = (cfg.TRAIN.OPTIMIZER == 'adam_onecycle') File "D:\Anaconda3\EPNet\tools..\tools\train_utils\train_utils.py", line 197, in train loss, tb_dict, disp_dict = self._train_it(batch) File "D:\Anaconda3\EPNet\tools..\tools\train_utils\train_utils.py", line 130, in _train_it loss, tb_dict, disp_dict = self.model_fn(self.model, batch) File "D:\Anaconda3\EPNet\tools..\lib\net\train_functions.py", line 37, in model_fn img = torch.from_numpy(data['img']).cuda(non_blocking = True).float().permute((0, 3, 1, 2)) KeyError: 'img'