Unable to add a manual TV timer

Hi,

Windows 10 Pro 64-bit
Kodi 16.1
NextPVT 3.9.2
OTA TV

I was unable to add a manual timer via Kodi on channel 2. I was able to do that on other channels.

An unexpected error occurred. Try again later or check the log for more information

In the log,

11:58:19 T:7596 ERROR: PVR – PVR::CPVRClient::AddTimer – addon ‘127.0.0.1:connected’ returned an error: the command failed
11:58:19 T:7596 ERROR: PVR – PVR::CPVRClients::AddTimer – cannot add timer to client ‘924’: the command failed

If I go to NextPVR application, I can add the manual timer.

What could be the problem? How can I fix it?

Thanks