Flexible array member error when initializing an array of structures [duplicate] - c++

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What is the reason for not being able to deduce array size from initializer-string in member variable?
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In class default initializer for array member C++11
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I'm building a LED control class for ESP32 using Arduino IDE and I'm facing problems regarding structuring its properties:
Reproducible example HERE
LEDS CLASS:
Leds.h
#pragma once
#include <Arduino.h>
enum LedState {
LED_OFF,
LED_ON,
LED_BLINK,
LED_PULSE
};
typedef struct {
char name[32];
int pin;
LedState state;
int start;
int delay;
int blinkCount;
} Led;
#define MAX_LEDS 50
class Leds
{
private:
Led leds[MAX_LEDS];
public:
void setup();
void loop();
};
Leds.cpp
#include "Leds.h"
void Leds::setup()
{
// some setup code here
}
void Leds::loop()
{
// put your main code here, to run repeatedly:
}
The Leds class is used in a config class, as follows:
CONFIG CLASS:
Config.h
#pragma once
#include "Leds.h"
class Config
{
public:
Led leds[] = {
{"status", 2, LED_OFF, 0, 0, 0},
{"test", 3, LED_OFF, 0, 0, 0},
};
void setup();
};
Config.cpp
#include <Arduino.h>
#include "Config.h"
void Config::setup()
{
// Do something here
}
When compiling I'm getting the following error:
src/Config.h:13:5: error: flexible array member 'Config::leds' in an otherwise empty 'class Config'
};
^
As far as I understood the Led struct has a fixed size - so no idea why I'm getting this error and how to solve it.