Cant sent data to Firebase

[darkkarot]

#include <ESP8266WiFi.h>
#include <FirebaseArduino.h>

// Set these to run example.
#define FIREBASE_HOST "xxxxx"
#define FIREBASE_AUTH "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
#define WIFI_SSID "xxxxxxx"
#define WIFI_PASSWORD "xxx"

float i = 0;
void setup() {

Serial.begin(115200);
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
Serial.print("connecting");

while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(500);
}

Serial.println();
Serial.print("connected: ");
Serial.println(WiFi.localIP());

Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);
}

void loop() {

Firebase.setFloat("cam_volt", i);
if (Firebase.failed()) {

Serial.println("set / failed:");
Serial.println(Firebase.error());  
return;

}

i++;

delay(1000);
}

complie not error
but databaase in firebase cant receive data form my esp8266

and monitor is below

connected: 192.168.43.121
set / failed:

set / failed:

i used Nodemcuv3