Cannot use Wifi

  • Hi guys,
    I am trying to use the wifi on the board but I get the following error at the wifi.begin line in the serial terminal :
    addApbChangeCallback(): duplicate func=400EAB44 arg=3FFBF008

    Here is my code :
    #include "M5StickCPlus.h"
    #include <WiFi.h>

    #define WIFI_SSID "router"
    #define WIFI_PASS "pass"

    void setup() {
    M5.begin(true, true, true);
    Serial.printf("Connecting to %s ", WIFI_SSID);
    WiFi.begin(WIFI_SSID, WIFI_PASS);
    while (WiFi.status() != WL_CONNECTED) {

    I also tried to declare WIFI_SSID and the WIFI_PASS as a const char*. However, it does not work either. I cannot compile, I have this error : "error: invalid conversion from 'const char*' to 'char*'"

    What am I missing?