MacOS Mojave，python3.7.2 ,paramiko 2.4.2, cryptography 2.4.2
I created a private key:
ssh-keygen -t rsa
When I tried to load the key , I get some exception.
key = paramiko.RSAKey.from_private_key_file(path)
The exception:

Traceback (most recent call last):
  File "/Users/tianyawei/PycharmProjects/protocolTest/CUAdapterV1/AdapterMachine/Machine", line 154, in <module>
    run()
  File "/Users/tianyawei/PycharmProjects/protocolTest/CUAdapterV1/AdapterMachine/Machine", line 131, in run
    key = paramiko.RSAKey.from_private_key_file(path)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/paramiko/pkey.py", line 206, in from_private_key_file
    key = cls(filename=filename, password=password)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/paramiko/rsakey.py", line 55, in __init__
    self._from_private_key_file(filename, password)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/paramiko/rsakey.py", line 175, in _from_private_key_file
    data = self._read_private_key_file("RSA", filename, password)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/paramiko/pkey.py", line 279, in _read_private_key_file
    data = self._read_private_key(tag, f, password)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/paramiko/pkey.py", line 289, in _read_private_key
    raise SSHException("not a valid " + tag + " private key file")
paramiko.ssh_exception.SSHException: not a valid RSA private key file

the openssh private key：

Please help me.

I have some nodes that define Port, MAC and IP for PXE, but some nodes aren't I expect they will continue to run with nodes that got define ip but they failed.

Node Type: power-servers:
In-Inventory Switch Port MAC IP Port type

False mgmt_switch 26 - - pxe
True mgmt_switch 24 14:63:08:00:18:00 192.168.20.184 pxe
True mgmt_switch 8 14:63:08:00:16:d4 192.168.20.164 pxe
True mgmt_switch 30 14:63:08:00:17:38 192.168.20.175 pxe
True mgmt_switch 32 14:63:08:00:17:88 192.168.20.153 pxe

WARNING - Incomplete! Found 4 of 5 nodes

Press enter to continue gathering port information.
Enter C to continue Cluster Genesis or 'T' to terminate C
INFO - 'C' entered. Continuing Genesis
INFO - Successfully ran '/opt/cluster-genesis/gen-venv/bin/python /opt/cluster-genesis/scripts/python/inv_add_ports.py /var/lib/misc/dnsmasq.leases pxe' in the container 'cluster-genesis-pxe20'
PXE ports added to inventory
...
f(self, value, write)
File "/usr/lib/python2.7/xmlrpclib.py", line 659, in dump_nil
raise TypeError, "cannot marshal None unless allow_none is enabled"
TypeError: cannot marshal None unless allow_none is enabled
ERROR - Failed running '/opt/cluster-genesis/gen-venv/bin/python /opt/cluster-genesis/scripts/python/cobbler_add_systems.py' in the container 'cluster-genesis-pxe20'
Fail: Failed running '/opt/cluster-genesis/gen-venv/bin/python /opt/cluster-genesis/scripts/python/cobbler_add_systems.py' in the container 'cluster-genesis-pxe20'
ubuntu@power-haines-deployer:~/cluster-genesis$