Try to rollback anaconda environment but met PackagesNotFoundError: The following packages are missing from the target environment

I mistakenly re-installed opencv in anaconda environment. These packages are changed:

The following packages will be SUPERSEDED by a higher-priority channel:

  ca-certificates    conda-forge::ca-certificates-2021.5.3~ --> pkgs/main::ca-certificates-2021.5.25-haa95532_1
  certifi            conda-forge::certifi-2021.5.30-py36ha~ --> pkgs/main::certifi-2021.5.30-py36haa95532_0
  openssl            conda-forge::openssl-1.1.1k-h8ffe710_0 --> pkgs/main::openssl-1.1.1k-h2bbff1b_0

Then I met this error in my program.

Traceback (most recent call last):
  File "C:\Users\generative_inpainting-master\test.py", line 3, i
n <module>
    import cv2
ModuleNotFoundError: No module named 'cv2'

I tried to rollback the environment by using anaconda's conda install –revision 21 but I got

PackagesNotFoundError: The following packages are missing from the target environment:
  - conda-forge/win-64::certifi==2021.5.30=py36ha15d459_0
  - conda-forge/win-64::openssl==1.1.1k=h8ffe710_0
  - conda-forge/win-64::ca-certificates==2021.5.30=h5b45459_0

I don't know how to fix that. Please help me. Thank you all.

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