'checkGPS' and 'displayInfo' was not declared in this scop

Arduino:1.6.9 (Windows 10), Tarjeta:"NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Disabled, 4M (3M SPIFFS), v2 Lower Memory, Disabled, None, Only Sketch, 115200"

C:\Users\Usuario\Desktop\UbicaBus\RoboShalaGPSTracker\RoboShalaGPSTracker.ino: In function 'void setup()':

RoboShalaGPSTracker:38: error: 'checkGPS' was not declared in this scope

   timer.setInterval(5000, checkGPS); // every 5s check if GPS is connected, only really needs to be done once

                           ^

C:\Users\Usuario\Desktop\UbicaBus\RoboShalaGPSTracker\RoboShalaGPSTracker.ino: In function 'void loop()':

RoboShalaGPSTracker:56: error: 'displayInfo' was not declared in this scope

         displayInfo();

                     ^

exit status 1
'checkGPS' was not declared in this scope

Hello. We are not really here to troubleshoot your apparently non-Blynk related code or syntax issues… particularly when we can’t see it anyhow, nor do we know what libraries you may be missing, etc.

Perhaps you could supply a bit more background, details, code, reason… so on?

Thanks for reading.The situation is as follows: I am trying to connect Nodemcu Esp8266 and Ublox Neo 6M to Blynk to make a “GPS tracker” but in the programming in the Arduino interface those two errors arose that I can not find the reason or solution.