Thanks. true. Gave that a try. Still no success. When validating the config (which is fine without modbus) i get the spinning wheel.
and this is in the logs:
Traceback (most recent call last):
File "/usr/local/lib/python3.9/site-packages/aiohttp/web_protocol.py", line 435, in _handle_request
resp = await request_handler(request)
File "/usr/local/lib/python3.9/site-packages/aiohttp/web_app.py", line 504, in _handle
resp = await handler(request)
File "/usr/local/lib/python3.9/site-packages/aiohttp/web_middlewares.py", line 117, 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 98, in forwarded_middleware
return await handler(request)
File "/usr/src/homeassistant/homeassistant/components/http/request_context.py", line 28, 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 181, in auth_middleware
return await handler(request)
File "/usr/src/homeassistant/homeassistant/components/http/view.py", line 137, in handle
result = await result
File "/usr/src/homeassistant/homeassistant/components/config/core.py", line 29, in post
errors = await async_check_ha_config_file(request.app["hass"])
File "/usr/src/homeassistant/homeassistant/config.py", line 938, in async_check_ha_config_file
res = await check_config.async_check_ha_config_file(hass)
File "/usr/src/homeassistant/homeassistant/helpers/check_config.py", line 183, in async_check_ha_config_file
config = config_schema(config)
File "/usr/local/lib/python3.9/site-packages/voluptuous/schema_builder.py", line 272, in __call__
return self._compiled([], data)
File "/usr/local/lib/python3.9/site-packages/voluptuous/schema_builder.py", line 594, in validate_dict
return base_validate(path, iteritems(data), out)
File "/usr/local/lib/python3.9/site-packages/voluptuous/schema_builder.py", line 386, in validate_mapping
cval = cvalue(key_path, value)
File "/usr/local/lib/python3.9/site-packages/voluptuous/validators.py", line 215, in _run
return self._exec(self._compiled, value, path)
File "/usr/local/lib/python3.9/site-packages/voluptuous/validators.py", line 339, in _exec
v = func(path, v)
File "/usr/local/lib/python3.9/site-packages/voluptuous/schema_builder.py", line 817, in validate_callable
return schema(data)
File "/usr/src/homeassistant/homeassistant/components/modbus/validators.py", line 201, in duplicate_entity_validator
addr = str(entry[CONF_ADDRESS])
KeyError: 'address'