Mediaportal plugin error: Cannot read PVR client name string properties

[SquackMcDuck]

Hi guys.

I have a problem : ### PVR client doesn't start

This is the sympthom.
https://imagizer.imageshack.com/img923/2430/l588XA.jpg
PVR Manager is starting up... 0%

HW/SW configuration:
Kodi 20.1, Windows 11 , Mediaportal 2 ver. 1.23.200.0 , VLC 3.0.18 (just for test Mediaportal Live TV)
Intel core i5 , 16 GB Ram, 256Gb Disk + some TB of externak HD drives, TVB-T/T2/C Usb stick.

A brief history:
I activated new weeks ago Mediaportal Addon and it working but video was a little bit jerky.
So, I triyed to change LiveTv server and Kodi addon. I test few addons but the best is MediaPortal, so I try to go back and enable it again uninstalling all others LiveTV server external to Kodi.
When I enabled again MediaPortal Addon I got the message shown in the image on the top.

I already disabed/enabled addon and also uninstalled it/reinstalled. Nothing change.
I configured newly MediaPortal addon and input static ip address and other infos and had same error: PVR continue turn at 0%.
I disabled also Automatc Updates of MediaPortal Addon. Same result.

I test MediaPortal Server Live TV server as shown here using VLC and all work fine: with MediaPortal Server + VNC video is not jerky anymore it is fluid and smoothly.
So, the problem is limited to MediaPortal addon/Kodi.

In the end I see the log. I enabled log for specific PVR component and this is the result:

2023-10-11 10:34:02.423 T:4148    error <general>: GetAddonNameStringProperties: Add-on 'pvr.mediaportal.tvserver' returned an error: server error
2023-10-11 10:34:02.423 T:4148    error <general>: PVR::CPVRClient::SetConnectionState: Cannot read PVR client name string properties
2023-10-11 10:34:04.454 T:4148    error <general>: GetAddonNameStringProperties: Add-on 'pvr.mediaportal.tvserver' returned an error: server error
2023-10-11 10:34:04.455 T:4148    error <general>: PVR::CPVRClient::SetConnectionState: Cannot read PVR client name string properties
2023-10-11 10:34:04.455 T:4148    error <general>: AddOnLog: pvr.mediaportal.tvserver: Could not connect to MediaPortal TV Server backend.
2023-10-11 10:34:04.455 T:4148    error <general>: GetAddonNameStringProperties: Add-on 'pvr.mediaportal.tvserver' returned an error: server error

I don't found any informations about error reported in log.

I found the log error message in file names PVRClient.cpp

void CPVRClient::SetConnectionState(PVR_CONNECTION_STATE state)
{
  if (state == PVR_CONNECTION_STATE_CONNECTED)
  {
    // update properties - some will only be available after add-on is connected to backend
    if (!GetAddonProperties())
      CLog::LogF(LOGERROR, "Error reading PVR client properties");
  }
  else
  {
    if (!GetAddonNameStringProperties())
      CLog::LogF(LOGERROR, "Cannot read PVR client name string properties");
  }
[...]
}

but i'm not a software developer and I don't understand calls between KODI code and Mediaportal addon code.

So, anyone has any idea or canhelp me to start PVR ?

Thank for any reply and please forgive me for my bad english.