I fixed my problem today.
The error was describes in this thread
Postgre integration / gw.UplinkRXInfo - #4 by miimote
In chirpstack-application-server.toml, if you have
marshaler=“json_v3”
you will get the related error. You must change to
marshaler=“json”
as it was advised in the comments of configuration file.
My problem was that I used locate chirpstack-application-server.toml but I was not Super User.
So I only saw a version in my users home folder. And this was not the one that Chirpstack-application-server was using.
When I did a
sudo locate chirpstack-application-server.toml
This show me a version af the file in
/etc/chirpstack-application-server/chirpstack-application-server.toml
And when I changed marshaler to json and ran
sudo systemctl restart chirpstack-application-server
I then again got the packages saved in the database.
Hopes this helps you