RAK5146 "WARNING: [gps] could not get a valid message from GPS (no time)"

I’m trying to get the GPS time from the raspberry pi3 gateway with the RAK5146 concentrator for the geolocation of LoRaWAN devices. I have used the following repo for setting up the gateway GitHub - RAKWireless/rak_common_for_gateway.

This is what i’m getting

Invalid time reference (age: 1683099124 sec)

no valid GPS coordinates available yet

END

JSON up: {“stat”:{“time”:“2023-05-03 07:32:04 GMT”,“rxnb”:1,“rxok”:1,“rxfw”:1,“ackr”:50.0,“dwnb”:0,“txnb”:0,“temp”:0.0}}
INFO: [down] PULL_ACK received in 120 ms
WARNING: [gps] could not get a valid message from GPS (no time)
WARNING: [gps] could not get a valid message from GPS (no time)

Please share the solution if any

Regards,
Gokhil