AttributeError: Couldn't find 'wavelength' in the effect registry

[barbatrukko]

I used this guide
https://www.youtube.com/watch?v=ipSfQdfX4fE

Windows 10, last anaconda, ledfx python=3.6 like guide

al setup process is ok, but
When I start device and select effect, I see waveform but led not start....
If I try to stop device I receive

[2020-10-15 20:43:40] ERROR:aiohttp.server:Error handling request
Traceback (most recent call last):
  File "c:\users\nemo\anaconda3\envs\ledfx\lib\site-packages\aiohttp\web_protocol.py", line 378, in start
    resp = await self._request_handler(request)
  File "c:\users\nemo\anaconda3\envs\ledfx\lib\site-packages\aiohttp\web_app.py", line 341, in _handle
    resp = await handler(request)
  File "c:\users\nemo\anaconda3\envs\ledfx\lib\site-packages\ledfx\api\__init__.py", line 26, in handler
    return await method(**{arg_name: available_args[arg_name] for arg_name in wanted_args})
  File "c:\users\nemo\anaconda3\envs\ledfx\lib\site-packages\ledfx\api\device_effects.py", line 50, in put
    config = effect_config)
  File "c:\users\nemo\anaconda3\envs\ledfx\lib\site-packages\ledfx\utils.py", line 284, in create
    type, self._cls.__name__.lower()))
AttributeError: Couldn't find 'wavelength' in the effect registry

and device switch not work until I don't select effect again.
If look on device web page, WLED tell me that device receive data from E1.31