Running pypi.douban.com/simple in setup ProtocoError

[chadrs2]

In following the installation of yoso, I run the line pip install pycocotools -i https://pypi.douban.com/simple. However, I get the error

Defaulting to user installation because normal site-packages is not writeable
Looking in indexes: https://pypi.douban.com/simple
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', RemoteDisconnected('Remote end closed connection without response'))': /simple/pycocotools/
ERROR: Could not find a version that satisfies the requirement pycocotools (from versions: none)
ERROR: No matching distribution found for pycocotools

Can I just skip this step or how would I fix this?