utils.sw.install gives int() argument must be a string, a bytes-like object or a number, not 'NoneType'

I am trying to upgrade the EX2300 with 48 POE+ switch using below code. I don’t set any time out parameters in install function. Everything is using the default value.

with Device(host=hostname, user=junos_username, passwd=junos_password) as dev:
        print("Connecting to {}".format(hostname))
        if dev.connected:
            print("Device connected")
            sw = SW(dev)`
            ok = sw.install(
                package=firware_update_files,
                progress=my_progress,
                no_copy=True,
                validate=False,
                cleanfs=True,
            )

I get this exception

192.168.1.2:request-package-checks-pending-install rpc is not supported on given device
192.168.1.2:installing software ... please be patient ...
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/jnpr/junos/device.py", line 227, in timeout
    self._conn.timeout = int(value)
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/jnpr/junos/decorators.py", line 24, in wrapper
    dev.timeout = restore_timeout
  File "/usr/local/lib/python3.8/dist-packages/jnpr/junos/device.py", line 229, in timeout
    raise RuntimeError(
RuntimeError: could not convert timeout value of None to an integer

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/jnpr/junos/device.py", line 227, in timeout
    self._conn.timeout = int(value)
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/..../devel/ros_ws/src/bg_sandbox/juno_config/scripts/juno_update.py", line 62, in <module>
    main()
  File "/home/..../devel/ros_ws/src/bg_sandbox/juno_config/scripts/juno_update.py", line 37, in main
    ok = sw.install(
  File "/usr/local/lib/python3.8/dist-packages/jnpr/junos/utils/sw.py", line 990, in install
    add_ok = self.pkgadd(
  File "/usr/local/lib/python3.8/dist-packages/jnpr/junos/utils/sw.py", line 240, in pkgadd
    rsp = self.rpc.request_package_add(**args)
  File "/usr/local/lib/python3.8/dist-packages/jnpr/junos/rpcmeta.py", line 364, in _exec_rpc
    return self._junos.execute(rpc, **dec_args)
  File "/usr/local/lib/python3.8/dist-packages/jnpr/junos/decorators.py", line 76, in wrapper
    return function(*args, **kwargs)
  File "/usr/local/lib/python3.8/dist-packages/jnpr/junos/decorators.py", line 27, in wrapper
    dev.timeout = restore_timeout
  File "/usr/local/lib/python3.8/dist-packages/jnpr/junos/device.py", line 229, in timeout
    raise RuntimeError(
RuntimeError: could not convert timeout value of None to an integer

[volans-]

I got the same issue and I had to pass the conn_open_timeout parameter to the call to Device in my case to fix the issue.

It seems to me that the culprit, at least in my case, is this commit https://github.com/Juniper/py-junos-eznc/commit/84fe8c6fe337e2488893126517bf1dd2c1f6edbf because it uses None as default value for:

self._conn_open_timeout = kvargs.get('conn_open_timeout', None)

that is later used as a value for the timeout parameter inside open() at line 1312:

timeout=self._conn_open_timeout,

[Bischoff]

Thanks @chidanandpujar . I was also getting it from junos salt-proxy when trying to apply a Salt state.