Graphing with node red and signalK

[JD1]

Here is a second run - ran fine until the type error. BTW, both this and the previous crash happened within a minute of restarting the signalk server. I also don't understand why signalk doesn't start up when opnplotter starts - I get no output on the signalk diagnostic window until I restart the signalk server.

pi@openplotter:~ $ openplotter
GET /signalk 200 10.308 ms - 194
GET /signalk 200 4.394 ms - 194
Connection is already closed.
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 47.806 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:~ $

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The NMEA0183 data comes from a Raymarine E80 via a USB-NMEA0183 convertor