Lutron Bridge (Not Caseta) and Home Assistant: "Invalid Config"

I’ve done some searching here on the forum and I believe all of the Lutron Bridge threads I’ve come across deal with the Caseta line. My question concerns the Lutron RadioRA 2 Connect Bridge.

I’ve edited the configuration.yaml file with the correct IP address:

lutron:
  lutron_host: 192.168.1.226
  lutron_user: lutron
  lutron_password: integration

But all I get from the web app is “Invalid Config” message. In the web app, Configuration | Server Management | Configuration Validation reports “valid.”

I’ve pasted the relevant entries from the log below. Any ideas for me?

17-04-18 10:11:14 ERROR (MainThread) [homeassistant.components.device_tracker] Unable to load C:\Users\Network Closet\AppData\Roaming\.homeassistant\known_devices.yaml: Config file not found: C:\Users\Network Closet\AppData\Roaming\.homeassistant\known_devices.yaml
17-04-18 10:11:16 ERROR (MainThread) [homeassistant.setup] Error during setup of component lutron
Traceback (most recent call last):
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\urllib\request.py", line 1318, in do_open
    encode_chunked=req.has_header('Transfer-encoding'))
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\http\client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\http\client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\http\client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\http\client.py", line 1026, in _send_output
    self.send(msg)
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\http\client.py", line 964, in send
    self.connect()
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\http\client.py", line 936, in connect
    (self.host,self.port), self.timeout, self.source_address)
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\socket.py", line 722, in create_connection
    raise err
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\socket.py", line 713, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [WinError 10061] No connection could be made because the target machine actively refused it

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\site-packages\homeassistant\setup.py", line 192, in _async_setup_component
    None, component.setup, hass, processed_config)
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\concurrent\futures\thread.py", line 55, in run
    result = self.fn(*self.args, **self.kwargs)
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\site-packages\homeassistant\components\lutron.py", line 36, in setup
    hass.data[LUTRON_CONTROLLER].load_xml_db()
  File "C:\Users\Network Closet\AppData\Roaming\.homeassistant\deps\pylutron\__init__.py", line 330, in load_xml_db
    xmlfile = urllib.request.urlopen('http://' + self._host + '/DbXmlInfo.xml')
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\urllib\request.py", line 223, in urlopen
    return opener.open(url, data, timeout)
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\urllib\request.py", line 526, in open
    response = self._open(req, data)
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\urllib\request.py", line 544, in _open
    '_open', req)
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\urllib\request.py", line 504, in _call_chain
    result = func(*args)
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\urllib\request.py", line 1346, in http_open
    return self.do_open(http.client.HTTPConnection, req)
  File "c:\users\network closet\appdata\local\programs\python\python36-32\lib\urllib\request.py", line 1320, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error [WinError 10061] No connection could be made because the target machine actively refused it>