How to fix 'var - create: unable to create variable object' error in c++

I'm currently programming a weatherstation in c++ which should run on a Raspberry Pi 3B+. I use the Visual Studio 2019 IDE with an extension to debug and run the code directly on my Raspberry. At the moment I'm trying to implement a DHT11 sensor to measure the temperature and humidity. However, because i don't get the expected output, I debug the whole program and there always appears the error message 'var-create unable to create variable object' for the variable 'laststate' and 'counter'.

I've already watched at this var-create unable to create variable object and another one but i don't get whats's the issue.

#include <wiringPi.h>
#include <stdio.h>
#include <iostream>
#include <cstring>
#include <errno.h>
#include <stdlib.h>
#include <stdint.h>


#define MAX_TIMINGS 85
#define DHT_PIN     3   /* GPIO-22 */

int data[5] = { 0, 0, 0, 0, 0 };

void read_dht_data();

int main(void)
{
        std::cout << ("Raspberry Pi DHT11/DHT22 temperature/humidity test\n");

    if (wiringPiSetup() == -1)
    {
        std::cout << "Failed to setup wiringPi" << std::endl;

        //exit(1);
    }
    else
    {
        std::cout << "WiringPi setup success!" << std::endl;
    }


    while (1)
    {
        read_dht_data();
        delay(2000); /* wait 2 seconds before next read */
    }

    return(0);
}


void read_dht_data()
{

    uint8_t laststate = 1;
u   int8_t counter = 0;

    uint8_t j = 0, i;

    data[0] = data[1] = data[2] = data[3] = data[4] = 0;

    /* pull pin down for 18 milliseconds */
    pinMode(DHT_PIN, OUTPUT);
    digitalWrite(DHT_PIN, LOW);
    delay(18);

    /* prepare to read the pin */
    pinMode(DHT_PIN, INPUT);

    /* detect change and read data */
    for (i = 0; i < MAX_TIMINGS; i++)
    {                                           
        while (digitalRead(DHT_PIN) == laststate)
        {
            counter++;
            delayMicroseconds(1);
            if (counter == 255)
            {
                break;
            }
        }
        laststate = digitalRead(DHT_PIN);

        if (counter == 255)
            break;

        /* ignore first 3 transitions */
        if ((i >= 4) && (i % 2 == 0))
        {
            /* shove each bit into the storage bytes */
            data[j / 8] <<= 1;
            if (counter > 16)
                data[j / 8] |= 1;
            j++;
        }
    }

    /*
     * check we read 40 bits (8bit x 5 ) + verify checksum in the last byte
     * print it out if data is good
     */
    if ((j >= 40) &&
        (data[4] == ((data[0] + data[1] + data[2] + data[3]) & 0xFF)))
    {
        float h = (float)((data[0] << 8) + data[1]) / 10;
        if (h > 100)
        {
            h = data[0];    // for DHT11
        }
        float c = (float)(((data[2] & 0x7F) << 8) + data[3]) / 10;
        if (c > 125)
        {
            c = data[2];    // for DHT11
        }
        if (data[2] & 0x80)
        {
            c = -c;
        }
        //float f = c * 1.8f + 32;
        std::cout << "Humidity = " << h << " %% Temperature = " << c << " �C" << std::endl;
    }
    else {
        std::cout << "Data not good, skip";
    }
}

I hope somebody could help me to figure out, what's the issue.

Thank you for your help!