NMEA0183 Generator fail to start

[kste]

Because sentence set automatically (MTW) is wrong, I tried to change it with MTA (Opencpn only recognizes this) or XDR.
I did a lot of tests, but I always get the NMEA0183 diagnostic that tells me:

An exception of type occured.Arguments timeout:

using:
python .config / openplotter / openplotter
does not display any error message

I then restored
sentences = [['MTW', [['environment.inside.temperature.value', 'x.x', '+', 0.0], 'C'], 1.0]]

but I always get:
An exception of type occured.Arguments timeout:

I removed and reinstalled openplotter and restored the NMEA string (either by editing the file openplotter.conf, both NMEA0183GENERATOR)
but I always get:
An exception of type occured.Arguments timeout:

Nmea not the output is longer produced for temperature, while signalK values are ok.

What can I do?