[Bug]: No module named 'pymodbus.pdu.register_message'

[djunkee]

Describe the issue

I have installed the integration on my home assistant.
After installation and restarting the system, I am trying to set up the integration, but I get the following error:
Error
Config flow could not be loaded: {"message":"Invalid handler specified"}

This happens when I am trying to start the integration setup.

My Home Assistant core logs contain the following error message:

Logger: homeassistant.config_entries
Source: config_entries.py:3314
First occurred: 10:51:26 PM (1 occurrences)
Last logged: 10:51:26 PM

Error occurred loading flow for integration huawei_solar: No module named 'pymodbus.pdu.register_message'

I have another ModBus integration running, could that be related?

Home Assistant Version is: 2025.1.4

(I have the integration successfully running on another Home Assistant setup of mine.)

Describe your Huawei Solar Setup

Irrelevant here.

How do you connect to the inverter?

Please select your connection method

Upload your Diagnostics File

Drag & Drop your Diagnostics File here.

Upload your relevant debug logs

Logger: homeassistant.config_entries
  Source: config_entries.py:3314
  First occurred: 10:51:26 PM (1 occurrences)
  Last logged: 10:51:26 PM
  
  Error occurred loading flow for integration huawei_solar: No module named 'pymodbus.pdu.register_message'

Please confirm the following:

• I'm running the latest release of Home Assistant.
• I'm running the latest release of this integration.
• I did not find an existing issue describing this problem.
• I did upload the diagnostics-file that I could retrieve from the 'Devices & Services Page'
• I did upload the relevant debug logs (via 'Enable Debug Logging'-feature or by manually configuring HA logging)