Could not find a version that satisfies the requirement opencv-python (from versions: none)

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when conda env create --file environment.yml

Installing pip dependencies: / Ran pip subprocess with arguments:
['C:\\Users\\32173\\miniconda3\\envs\\gaussian_splatting\\python.exe', '-m', 'pip', 'install', '-U', '-r', 'C:\\Users\\]
Pip subprocess output:
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Processing c:\users\32173\gaussian-splatting\submodules\diff-gaussian-rasterization
  Preparing metadata (setup.py): started
  Preparing metadata (setup.py): finished with status 'done'
Processing c:\users\32173\gaussian-splatting\submodules\simple-knn
  Preparing metadata (setup.py): started
  Preparing metadata (setup.py): finished with status 'done'
Processing c:\users\32173\gaussian-splatting\submodules\fused-ssim
  Preparing metadata (setup.py): started
  Preparing metadata (setup.py): finished with status 'done'

Pip subprocess error:
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'Pro/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'Pro/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'Pro/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'Pro/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'Pro/
ERROR: Could not find a version that satisfies the requirement opencv-python (from versions: none)
ERROR: No matching distribution found for opencv-python

failed

CondaEnvException: Pip failed

can you help me