undefined reference to `MainController::begin()' in Platform.io Project [closed] - c++

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I'm a bit lost here and don't really get why i run into this compile error.
I have a Arduino Nano Project set up with platform.io
My main.cpp looks like this:
#include <WiFiNINA.h>
#include "MainController.h"
void setup()
{
MainController mainController;
pinMode(LEDR, OUTPUT);
pinMode(LEDG, OUTPUT);
pinMode(LEDB, OUTPUT);
mainController.begin();
digitalWrite(LEDR, HIGH);
digitalWrite(LEDG, HIGH);
digitalWrite(LEDB, LOW);
delay(1000);
}
void loop()
{
//mainController.update();
digitalWrite(LEDR, LOW);
digitalWrite(LEDG, HIGH);
}
MainController.cpp:
#include <MotorController.h>
class MainController {
public:
MainController() {
}
void begin() {
motorController.begin();
}
void update() {
}
private:
MotorController motorController;
};
MainController.h:
#ifndef MAINCONTROLLER_H
#define MAINCONTROLLER_H
#include "MotorController.h"
// #include "ServoController.h"
class MainController
{
public:
MainController();
void begin();
void update();
private:
MotorController motorController;
// ServoController servoController;
};
#endif
So, when i try to compile it i get this compile error:
/Users/mneuhaus/.platformio/packages/toolchain-gccarmnoneeabi/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld: .pio/build/nanorp2040connect/src/main.cpp.o: in function `setup':
main.cpp:(.text.setup+0x4): undefined reference to `MainController::MainController()'
/Users/mneuhaus/.platformio/packages/toolchain-gccarmnoneeabi/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld: main.cpp:(.text.setup+0x28): undefined reference to `MainController::begin()'
collect2: error: ld returned 1 exit status
*** [.pio/build/nanorp2040connect/firmware.elf] Error 1
as far as i can tell all the classes, methods, etc are named correctly, no idea why i get these errors.

Answer 1

You don't need to repeat the class definition inside the cpp file. The implementation should loook like this:
#include "MainController.h"
void MainController::begin() {
motorController.begin();
}
// ...
I would also recommend removing the constructor if it does not do anythng.