how to fix Reverse geocoding is not enabled - RuntimeException (ServerResource:60 < ...)

please find the solution reverse geocoding is not enabled
i read all document of traccar related reverse geocoding but not find solution to resolve this exception

It appears you haven't read or understood all ;-)
Most should be listed on https://www.traccar.org/reverse-geocoding/

Try posting the output of grep -s geocoder /opt/traccar/conf/*xml

Have you restarted the traccar server (program, not machine) to make sure it have picked up the new settings?

I have read documents of reverse geocoding and add configuration but not resolved this error.
this command is use on server grep -s geocoder /opt/traccar/conf/*xml

I repeat:

Post the output of the grep command, when you have run it on the server.

If there is no output, then you haven't configured it correctly.

Have you restarted the traccar server program?

try
linux in systemctl (traccar.service) change line

ExecStart=/opt/traccar/jre/bin/java -jar tracker-server.jar conf/traccar.xml
to

ExecStart=/opt/traccar/jre/bin/java -Djdk.tls.client.protocols=TLSv1.2 -jar tracker-server.jar conf/traccar.xml

This last post really did help it took me a while before figuring that out. :-)