ImportError: cannot import name 'Config' from 'mmcv'

[050603]

Hello, I would like to consult about this error problem. I will get this error of mmcv after installing mmaction2 locally and on the server, what is the matter?

(open-mmlab) root@eais-bjpdzzkez0zzzoxdrueo-7c5c5b5cb7-knvqn:/mnt/workspace/mmaction2# python tools/test.py configs/recognition/tsn/tsn_r50_1x1x3_100e_kinetics400_rgb.py \

checkpoints/SOME_CHECKPOINT.pth \
--eval top_k_accuracy mean_class_accuracy

Traceback (most recent call last):
File "tools/test.py", line 9, in
from mmcv import Config, DictAction
ImportError: cannot import name 'Config' from 'mmcv' (/opt/conda/envs/open-mmlab/lib/python3.8/site-packages/mmcv/init.py)