'D4' was not declared in this scope

[Lup1n-3]

Hi, I'm having a problem compiling the code.

ESP8266-Wardriving:24:19: error: 'D4' was not declared in this scope
24 | SoftwareSerial ss(D4, D3); // RX, TX
| ^~
ESP8266-Wardriving:24:23: error: 'D3' was not declared in this scope
24 | SoftwareSerial ss(D4, D3); // RX, TX
| ^~
C:\Users\win 1o\Desktop\ESP8266-Wardriving-master\src\ESP8266-Wardriving\ESP8266-Wardriving.ino: In function 'void setup()':
ESP8266-Wardriving:10:20: error: 'D8' was not declared in this scope; did you mean 's8'?
10 | #define SD_CS D8
| ^~
C:\Users\win 1o\Desktop\ESP8266-Wardriving-master\src\ESP8266-Wardriving\ESP8266-Wardriving.ino:40:17: note: in expansion of macro 'SD_CS'
40 | if (!SD.begin(SD_CS)) {
| ^~~~~
Se encontraron varias bibliotecas para "SD.h"
Usado: C:\Users\win 1o\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\SD
No usado: C:\Program Files (x86)\Arduino\libraries\SD
exit status 1
'D4' was not declared in this scope`

[chopper-2656]

Make sure you have the following included. I also found that I had to revert back to an older ESP8266 firmware to resolve some issuess.

#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>
#include <ESP8266WiFi.h>
#include <SPI.h>
#include <SD.h>
#include <SoftwareSerial.h>
#include <TinyGPS++.h>
#include <TimeLib.h>