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AssertionError: ca_forward miss in module _ext

See original GitHub issue

hello,

The following error occurs when I run the train.py file. Is it the MMCV problem ?

C:\Users\admin\Anaconda3\envs\pytorch_envs\python.exe C:/Users/admin/Desktop/pytorch/UperNet_Swin/tools/train.py
Traceback (most recent call last):
  File "C:/Users/admin/Desktop/pytorch/UperNet_Swin/tools/train.py", line 13, in <module>
    from UperNet_Swin.mmseg.apis import set_random_seed, train_segmentor
  File "C:\Users\admin\Desktop\pytorch\UperNet_Swin\mmseg\apis\__init__.py", line 1, in <module>
    from .inference import inference_segmentor, init_segmentor, show_result_pyplot
  File "C:\Users\admin\Desktop\pytorch\UperNet_Swin\mmseg\apis\inference.py", line 8, in <module>
    from UperNet_Swin.mmseg.models import build_segmentor
  File "C:\Users\admin\Desktop\pytorch\UperNet_Swin\mmseg\models\__init__.py", line 1, in <module>
    from .backbones import *  # noqa: F401,F403
  File "C:\Users\admin\Desktop\pytorch\UperNet_Swin\mmseg\models\backbones\__init__.py", line 2, in <module>
    from .fast_scnn import FastSCNN
  File "C:\Users\admin\Desktop\pytorch\UperNet_Swin\mmseg\models\backbones\fast_scnn.py", line 7, in <module>
    from UperNet_Swin.mmseg.models.decode_heads.psp_head import PPM
  File "C:\Users\admin\Desktop\pytorch\UperNet_Swin\mmseg\models\decode_heads\__init__.py", line 4, in <module>
    from .cc_head import CCHead
  File "C:\Users\admin\Desktop\pytorch\UperNet_Swin\mmseg\models\decode_heads\cc_head.py", line 7, in <module>
    from mmcv.ops import CrissCrossAttention
  File "C:\Users\admin\Anaconda3\envs\pytorch_envs\lib\site-packages\mmcv\ops\__init__.py", line 3, in <module>
    from .cc_attention import CrissCrossAttention
  File "C:\Users\admin\Anaconda3\envs\pytorch_envs\lib\site-packages\mmcv\ops\cc_attention.py", line 10, in <module>
    '_ext', ['ca_forward', 'ca_backward', 'ca_map_forward', 'ca_map_backward'])
  File "C:\Users\admin\Anaconda3\envs\pytorch_envs\lib\site-packages\mmcv\utils\ext_loader.py", line 13, in load_ext
    assert hasattr(ext, fun), f'{fun} miss in module {name}'  
AssertionError: ca_forward miss in module _ext

Process finished with exit code 1

Thanks