error compiling

I want to make this project,

however when i want to compile te code i got this error, any help will be appreciated, i have zero knowledge with coding arduino

Nobody can read your tiny image. Post the error message in text mode please... also the code in code tags please...

/*

*/
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

#include "settings.h"
#include "settings_internal.h"
#include "settings_eeprom.h"

#include "channels.h"
#include "receiver.h"
#include "receiver_spi.h"
#include "buttons.h"
#include "state.h"

#include "ui.h"
#include <Servo.h>
#include <Stepper.h>

#include "timer.h"      // use this one in stead

#define SIGMOID             // Best
#define SIGMOID_P_SLOPE       1
#define SIGMOID_P_OFFSET      4
#define SIGMOID_T_SLOPE       1
#define SIGMOID_T_OFFSET      4

#define UP_RSSI_PIN         A5     // analog RSSI measurement pin
#define SX_RSSI_PIN         A6     // analog RSSI measurement pin
#define DX_RSSI_PIN         A7

// down antenna value is composed by mean of SX and DX values

#define TILT_SERVO_PIN       13     // Pan servo pin
#define BACKLIGHT_PIN        25     //diplay backlight pin on off



#define I2C_SLA    (0x3C) //monitor 12864. invece il 16x4 è al  0x3F

uint8_t I2C_SLA = 0x3c*2;
LiquidCrystal_I2C lcd(0x27,16,4);  // set the LCD address to 0x27 or 0x20


/////motor stepper definition///////////////////////////////////////////////////////////
// change this to the number of steps on your motor
#define STEPS 4096
// create an instance of the stepper class, specifying
// the number of steps of the motor and the pins it's
// attached to
Stepper stepper(STEPS, 6, 7, 8, 9); //IN1 sul pin 6
                                //IN2 sul pin 7
                                //IN3 sul pin 8
                                //IN4 sul pin 9
// the previous reading from the analog input
int previous = 0;

//int count = 0;
//int count2 = 0;
//int delayTime = 500;
//int val = 0;
//int motor_Speed = 4; //Si tratta di un motore passo passo unipolare con 4096 passi per una rotazione di 360 gradi.
//int motor_Step;
//int motor_direction_cw = 0;
//int cmotor_direction_cw = 0;
#define P_STEP_MAX           360 // equals to 4096 step
#define P_STEP_MIN           0
#define P_STEP_MAX_STEP      5 // equals to 57 step
#define P_STEP_MIN_STEP      0.1     // prevents windUP
#define P_DEADBAND           1
#define P_STEP_DIRECTION     1

float anglePan = 45;
boolean debug = false;
///////////////////////////////////////////////////////////////////////////////////////////////////////////
#define RSSI_OFFSET_C   0
#define RSSI_OFFSET_B    0
#define RSSI_OFFSET_A      0
#define RSSI_OFFSET_DW      0
#define RSSI_MAX            1024
#define RSSI_MIN            120
////////////////servo tilt definition//////////////////////
#define TSERVO_MAX           90
#define TSERVO_MIN           0
#define TSERVO_MAX_STEP      5
#define TSERVO_MIN_STEP      0.1     // prevents windUP and servo crawl
#define DEADBAND            5
#define TSERVO_DIRECTION     1
#define FIR_SIZE            10
#define LAST                FIR_SIZE - 1
float angleTilt = 45;

Servo servoTilt;
/////////////////////////////////////////////////////////////////
// timers
Timer t_measureRSSI = Timer(50);
Timer t_mainLoop = Timer(5);
////////////////////////////////////////////////////////77
uint16_t rssi_B_array[FIR_SIZE];
uint16_t rssi_C_array[FIR_SIZE];
uint16_t rssi_A_array[FIR_SIZE];
uint16_t rssi_DW_array[FIR_SIZE];

static void globalMenuButtonHandler(
  Button button,
  Buttons::PressType pressType
);


void setup()
{

   // Switch on the backlight
  pinMode ( BACKLIGHT_PIN, OUTPUT );
  digitalWrite ( BACKLIGHT_PIN, HIGH );
  
lcd.begin(16,4);               // initialize the lcd 
lcd.setCursor(0,0);
lcd.print("RSSI UP");
lcd.setCursor(1,0);
lcd.print("RSSI DW");
lcd.setCursor(2,0);
lcd.print("RSSI SX");
lcd.setCursor(3,0);
lcd.print("RSSI DX");

  /////////////////////////////////////////////////
  //  0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
  // 0O O O O O O O O O O  O O  O  O   O  O  O
  // 1O O O O O O O O O O  O O  O  O   O  O  O
  // 2O O O O O O O O O O  O O  O  O   O  O  O
  // 3O O O O O O O O O O  O O  O  O   O  O  O
  setupPins();

  servoTilt.attach(TILT_SERVO_PIN);
  servoTilt.write(45);
  for (int i = 0; i < FIR_SIZE; i++) {
    rssi_C_array[i] = 0;
    rssi_B_array[i] = 0;
  }
  for (int i = 0; i < FIR_SIZE; i++) {
    rssi_A_array[i] = 0;
    rssi_DW_array[i] = 0;
  }

  Serial.begin(115200);
  while (!debug) {
    delay(7000);
    debug = true;
  }
////////////////////////////////////////////////////////////////////////////////////////
  // set the speed of the motor in RPM
  // 90 deg in 4 seconds means 3.75rpm
  // 90 deg in 3 seconds means 5rpm
  // 90 deg in 2 seconds means 7,5rpm
  stepper.setSpeed(5);
////////////////////////////////////////////////////////////////////////////////////////


 // Enable buzzer and LED for duration of setup process.
  digitalWrite(PIN_LED, HIGH);
  digitalWrite(PIN_BUZZER, LOW);

  setupSettings();
  StateMachine::setup();
  Receiver::setup();
  Ui::setup();
  Receiver::setActiveReceiver(Receiver::ReceiverId::UP);

  //   #ifdef USE_IR_EMITTER
  //     Serial.begin(9600);
  //   #endif
  //   #ifdef USE_SERIAL_OUT
  //       Serial.begin(250000);
  //   #endif

  // setup complete.
      digitalWrite(PIN_LED, LOW);
      digitalWrite(PIN_BUZZER, HIGH);

  Buttons::registerChangeFunc(globalMenuButtonHandler);

  // Switch to initial state.
  StateMachine::switchState(StateMachine::State::SEARCH);
}

void setupPins() {
  //  pinMode(PIN_LED, OUTPUT);
  //  pinMode(PIN_BUZZER, OUTPUT);
  pinMode(PIN_BUTTON_UP, INPUT_PULLUP);
  pinMode(PIN_BUTTON_MODE, INPUT_PULLUP);
  pinMode(PIN_BUTTON_DOWN, INPUT_PULLUP);
  pinMode(PIN_BUTTON_SAVE, INPUT_PULLUP);

  pinMode(PIN_LED_A, OUTPUT);
#ifdef USE_DIVERSITY
  pinMode(PIN_LED_B, OUTPUT);
#endif
  pinMode(PIN_RSSI_A, INPUT_PULLUP);
#ifdef USE_DIVERSITY
  pinMode(PIN_RSSI_B, INPUT_PULLUP);
#endif

  pinMode(PIN_SPI_SLAVE_SELECT, OUTPUT);
  pinMode(PIN_SPI_DATA, OUTPUT);
  pinMode(PIN_SPI_CLOCK, OUTPUT);

  digitalWrite(PIN_SPI_SLAVE_SELECT, HIGH);
  digitalWrite(PIN_SPI_CLOCK, LOW);
  digitalWrite(PIN_SPI_DATA, LOW);
}

void setupSettings() {
  EepromSettings.load();
  Receiver::setChannel(EepromSettings.startChannel);
}


void loop() {

  // update timers
  if (t_measureRSSI.hasTicked()) {
    measureRSSI(); // do stuff 
    t_measureRSSI.reset();   // restart timer 
  }

  if (t_mainLoop.hasTicked()) {
    mainLoopLR();  // execute mainLoop
    t_mainLoop.reset(); // restart timer 
  }
  
  if (t_mainLoop.hasTicked()) {
    mainLoopUD();  // execute mainLoop
    t_mainLoop.reset(); // restart timer 
  }
  
  Receiver::update();
  Buttons::update();
  StateMachine::update();
  Ui::update();
  EepromSettings.update();


  if (
    StateMachine::currentState != StateMachine::State::SCREENSAVER
    && StateMachine::currentState != StateMachine::State::BANDSCAN
    && (millis() - Buttons::lastChangeTime) >
    (SCREENSAVER_TIMEOUT * 1000)
  ) {
    StateMachine::switchState(StateMachine::State::SCREENSAVER);
  }
}


static void globalMenuButtonHandler(
  Button button,
  Buttons::PressType pressType
) {
  if (
    StateMachine::currentState != StateMachine::State::MENU &&
    button == Button::MODE &&
    pressType == Buttons::PressType::HOLDING
  ) {
    StateMachine::switchState(StateMachine::State::MENU);
  }
}

Arduino:1.8.12 (Windows 10), Board:“Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)”

rx5808-pro-diversity-PANTILT_3HELI:40:21: error: expected unqualified-id before numeric constant

#define I2C_SLA (0x3C) //monitor 12864. invece il 16x4 è al 0x3F

^

C:\Users\nikok\Downloads\rx5808-pro-diversity-PANTILT_3HELI\rx5808-pro-diversity-PANTILT_3HELI\rx5808-pro-diversity-PANTILT_3HELI.ino:42:9: note: in expansion of macro ‘I2C_SLA’

uint8_t I2C_SLA = 0x3c*2;

^~~~~~~

rx5808-pro-diversity-PANTILT_3HELI:40:21: error: expected ‘)’ before numeric constant

#define I2C_SLA (0x3C) //monitor 12864. invece il 16x4 è al 0x3F

^

C:\Users\nikok\Downloads\rx5808-pro-diversity-PANTILT_3HELI\rx5808-pro-diversity-PANTILT_3HELI\rx5808-pro-diversity-PANTILT_3HELI.ino:42:9: note: in expansion of macro ‘I2C_SLA’

uint8_t I2C_SLA = 0x3c*2;

^~~~~~~

exit status 1
expected unqualified-id before numeric constant

Dit rapport zou meer informatie bevatten met
“Uitgebreide uitvoer weergeven tijden compilatie”
optie aan in Bestand → Voorkeuren.

When I downloaded the project you pointed to I got a sketch called "rx5808-pro-diversity.ino" and not the "rx5808-pro-diversity-PANTILT_3HELI.ino" that you seem to be compiling.

I can't compile "rx5808-pro-diversity.ino" in its default form because it complains about the screen size:

    #error("Screen size incorrect, please fix Adafruit_SSD1306.h!");

This part of the sketch makes no sense:

#define I2C_SLA    (0x3C) //monitor 12864. invece il 16x4 è al  0x3F

uint8_t I2C_SLA = 0x3c*2;

After applying the macro definition the second line becomes:

uint8_t (0x3C) = 0x3c*2;

It looks like someone is trying to declare I2C_SLA as both a macro and a variable. I suspect it should be one or the other. Figure out which one is correct and comment out the other.

Hi John, at the download column on the page u can choose both RSSI triversity antenna tracker and rssi antenna tracker pan/tilt on the left side. the one below (pan/tilt) is what i downloaded

thanks for helping, i will look into that

It appears that the I2C_SLA name isn't used anywhere in the sketch so you can safely comment out BOTH declarations (macro and variable).

//#define I2C_SLA    (0x3C) //monitor 12864. invece il 16x4 è al  0x3F


// uint8_t I2C_SLA = 0x3c*2;
LiquidCrystal_I2C lcd(0x27,16,4);  // set the LCD address to 0x27 or 0x20

johnwasser:
It appears that the I2C_SLA name isn't used anywhere in the sketch so you can safely comment out BOTH declarations (macro and variable).

//#define I2C_SLA    (0x3C) //monitor 12864. invece il 16x4 è al  0x3F

// uint8_t I2C_SLA = 0x3c*2;
LiquidCrystal_I2C lcd(0x27,16,4);  // set the LCD address to 0x27 or 0x20

This actually helped compiling the sketch without errors! However i can't get both screens (the 128x64OLED and the 16X4 LCD) to work.

For a self confessed newbie this complex code to begin with. Should you not first try simpler examples to understand the basics of C++