I have a new Three phase meter and want to add into my Home Assistant via custom component(HACS) -modbus/tcp. 

The first on has been running ok so far by this link 

https://imeter.club/topic/352

but the second add in has always fail with "Unknow error occurred" 

Please suggest

Tonight, After back from work. I try it over again with no error. Everything is working fine. Still doubt what is going on.

Thanks you very much for your support.

Hello, I have applied for permission to access this log. Please go through the following

Ok here is my home assistant full log.

https://drive.google.com/file/d/1gm0mBBcvBojAh7WIS2mTk1b0yZ2RUwWW/view?usp=drive_link

For Home assistant log, how to sent it to you?

I guess you want HA version number since meter software and add-on versions all given. 

Hello, please send me the version number and error log of homeassistant

I had try again follow your suggestion but problem still same.

Attached pics for your reference.

1. Please check if the version of iammeter_modbus you installed through hacs is v1.0.14
2. Please make sure your device is online when adding a device.
3. Also check if the firmware version of your meter is greater than 2.75.92
4. This is a screenshot of my successful addition