我正在尝试在Pycharm（2019）中安装托管人。我收到以下错误
(venv) C:\Users\ilwadso1\OneDrive - Novartis Pharma AG\PyCharmWorkspace\CloudCustodian>pip install c7n
Collecting c7n
Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection o
bject at 0x00000233253D0D08>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed')': /simple/c7n/
Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection o
bject at 0x00000233253C3B08>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed')': /simple/c7n/
Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection o
bject at 0x00000233253C3048>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed')': /simple/c7n/
Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection o
bject at 0x00000233253C3EC8>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed')': /simple/c7n/
Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection o
bject at 0x00000233253C6708>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed')': /simple/c7n/
Could not find a version that satisfies the requirement c7n (from versions: )
No matching distribution found for c7n
请告知我所缺少的东西。