reverse geocoder error

I'm running Traccar 4.15 on raspberry Pi. When I click on "show address" I get a geocoder error "Geocoding failed - Signature does not match."
My xml file contains:

[object Object]

There's nothing in log file other than the error displayed on the web page.

Can anyone advise how to fix this please ?

Looks like some SSL issue. Try using system Java instead of the one that's bundled with the installer.