Visual Studio Code – Why: "identifier "vTaskDelay" is undefined"?

I use visual studio code with the current espressif plugin (IDF version 5.1.2). The following program can be compiled and executed on the esp32 without any problems:

#include <iostream>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"

#include "main.h"

void HelloCMake::run(int i)
{
    std::cout << "Hello World from C++ "<< i << 'n';
    vTaskDelay(pdMS_TO_TICKS(1000));
}

extern "C" void app_main(void)
{
    HelloCMake App;
    int i = 0;

    while (true)
    {
        App.run(i);
        i++;
    }    
}

However, the editor shows me the following:

1. identifier "vTaskDelay" is undefined
2. identifier "pdMS_TO_TICKS" is undefined

Why are the two problems still displayed? And how can I solve this, please?

Thanks!

Markus

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