It means that you haven't upgraded properly.
So your guide is wrong??
Upgrade process is very simple:
Make a database backup
Backup your config file (if modified)
Remove old version of Traccar
Install new version of Traccar
Restore config file (if applicable)
Start Traccar service
The guide is correct. I suspect you've made a mistake somewhere.
Hi, I have the same mistake. When I add devices.
https://www.traccar.org/forums/topic/rabota-s-oracle-12c/
After upgrading to 3.16 i get this error when i try to change maps.
Fresh install, no mods.
Any idea how to fix this?