Graphing with node red and signalK

[JD1]

Saillog:
I am finally able to supply the info you need. Today the configuration that ran fine yesterday for over an hour crashed almost immediately and repeatedly <shrug>
The following was captured on OpenCPN ver 4.6.1 running on the pi. OpenPlotter had the NMEA feed from the chart plotter enabled. When OpenPlotter started up, there was no action on the signalK diagnostic screen until I restarted the signalK server.

Here is the terminal window with all it's error messages:
pi@openplotter:~ $ openplotter
Connection is already closed.
Signal K starting
No settings/defaults.json available
[Errno 111] Connection refused
signalk-server running at 0.0.0.0:3000

Cannot open NGT-1-A device /dev/ttyOP_N2K

GET /signalk/v1/api/vessels/self 200 36.674 ms - 19
no unit for navigation.gnss.differentialReference
no unit for navigation.gnss.horizontalDilution
no unit for navigation.gnss.geoidalSeparation
no unit for navigation.gnss.satellites
no unit for navigation.gnss.quality
TypeError: Cannot read property 'toUpperCase' of undefined
at NMEA0183._decoder (/home/pi/.config/signalk-server-node/node_modules/nmea0183-signalk/codecs/GLL.js:52:15)
at NMEA0183.decode (/home/pi/.config/signalk-server-node/node_modules/nmea0183-signalk/lib/NMEA0183.js:259:26)
at Parser._decode (/home/pi/.config/signalk-server-node/node_modules/nmea0183-signalk/lib/index.js:128:44)
at /home/pi/.config/signalk-server-node/node_modules/nmea0183-signalk/lib/index.js:172:26
at arrayEach (/home/pi/.config/signalk-server-node/node_modules/lodash/lodash.js:537:11)
at Function.forEach (/home/pi/.config/signalk-server-node/node_modules/lodash/lodash.js:9359:14)
at Parser._transform (/home/pi/.config/signalk-server-node/node_modules/nmea0183-signalk/lib/index.js:169:7)
at Parser.Transform._read (_stream_transform.js:167:10)
at Parser.Transform._write (_stream_transform.js:155:12)
at doWrite (_stream_writable.js:334:12)
pi@openplotter:~ $

I will send the VDR file via email