hook is suddenly unavailable

[solauky]

It was used normally. But the hook is suddenly unavailable. What is the cause of this? Thank you ~ ~

2022-10-30 21:33:00,075 - mmdet - INFO - Automatic scaling of learning rate (LR) has been disabled.
Traceback (most recent call last):
File "tools/train.py", line 244, in
main()
File "tools/train.py", line 233, in main
train_detector(
File "/home/liuxx/lxx2252/mmdet/apis/train.py", line 192, in train_detector
runner.register_training_hooks(
File "/home/liuxx/anaconda3/envs/lxx2252/lib/python3.8/site-packages/mmcv/runner/base_runner.py", line 560, in register_training_hooks
self.register_lr_hook(lr_config)
File "/home/liuxx/anaconda3/envs/lxx2252/lib/python3.8/site-packages/mmcv/runner/base_runner.py", line 431, in register_lr_hook
self.register_hook(hook, priority='VERY_HIGH')
File "/home/liuxx/anaconda3/envs/lxx2252/lib/python3.8/site-packages/mmcv/runner/base_runner.py", line 278, in register_hook
assert isinstance(hook, Hook)
AssertionError