Error Config Flow could not be loaded

[carlonuccio]

Home Assistant 2021.6.2
Tuya Custom v0.1.6 (installed via HACS)

I'm not able to access to configuration page:

2021-06-05 11:26:46 ERROR (MainThread) [aiohttp.server] Error handling request
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/aiohttp/web_protocol.py", line 422, in _handle_request
    resp = await self._request_handler(request)
  File "/usr/local/lib/python3.8/site-packages/aiohttp/web_app.py", line 499, in _handle
    resp = await handler(request)
  File "/usr/local/lib/python3.8/site-packages/aiohttp/web_middlewares.py", line 119, in impl
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/security_filter.py", line 60, in security_filter_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/forwarded.py", line 76, in forwarded_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/request_context.py", line 24, in request_context_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/ban.py", line 78, in ban_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/auth.py", line 144, in auth_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/view.py", line 135, in handle
    result = await result
  File "/usr/src/homeassistant/homeassistant/components/config/config_entries.py", line 190, in post
    return await super().post(request)
  File "/usr/src/homeassistant/homeassistant/components/http/data_validator.py", line 63, in wrapper
    result = await method(view, request, *args, **kwargs)
  File "/usr/src/homeassistant/homeassistant/helpers/data_entry_flow.py", line 72, in post
    result = await self._flow_mgr.async_init(
  File "/usr/src/homeassistant/homeassistant/data_entry_flow.py", line 153, in async_init
    flow, result = await task
  File "/usr/src/homeassistant/homeassistant/data_entry_flow.py", line 179, in _async_init
    result = await self._async_handle_step(flow, flow.init_step, data, init_done)
  File "/usr/src/homeassistant/homeassistant/data_entry_flow.py", line 260, in _async_handle_step
    result: FlowResult = await getattr(flow, method)(user_input)
  File "/config/custom_components/tuya_custom/config_flow.py", line 271, in async_step_init
    if self.config_entry.state != config_entries.ENTRY_STATE_LOADED:
AttributeError: module 'homeassistant.config_entries' has no attribute 'ENTRY_STATE_LOADED'