Firebase-arduino esp 8266 error

I am new on ardiuno iwant to store data from esp8266 to firebase database

This is the error message displayed:

 Arduino: 1.6.8 (Windows 8.1), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, 115200, 4M (3M SPIFFS)"

D:\Arduino\simple\simple.ino: In function 'void setup()':

simple:29: error: no matching function for call to 'FirebaseArduino::setString(const char [4])'

   Firebase.setString("LED");

                           ^

D:\Arduino\simple\simple.ino:29:27: note: candidate is:

In file included from D:\Arduino\simple\simple.ino:2:0:

C:\Users\Pandey\Documents\Arduino\libraries\firebase-arduino-master\src/FirebaseArduino.h:126:8: note: void FirebaseArduino::setString(const String&, const String&)

   void setString(const String& path, const String& value);

        ^

C:\Users\Pandey\Documents\Arduino\libraries\firebase-arduino-master\src/FirebaseArduino.h:126:8: note:   candidate expects 2 arguments, 1 provided

simple:30: error: 'success' was not declared in this scope

   success();

           ^

exit status 1
no matching function for call to 'FirebaseArduino::setString(const char [4])'

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

MY CODE IS

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


// Set these to run example.

#define FIREBASE_HOST "https://XXXXXX.firebaseio.com/"

#define FIREBASE_AUTH "XXXXXXXXXXXXXXXXXXXXXXXXXXX"

#define WIFI_SSID "XXXXXXX"

#define WIFI_PASSWORD "XXXXXXX"
//const int ledPin = 14;

void setup() {
  Serial.begin(9600);
  Serial.println(WiFi.localIP());
  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);
  Firebase.setString("LED");
  success();
}

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varun_pandey:
simple:29: error: no matching function for call to ‘FirebaseArduino::setString(const char [4])’

Firebase.setString(“LED”);

^

When all else fails, read the documentation:
http://firebase-arduino.readthedocs.io/en/latest/#_CPPv2N15FirebaseArduino9setStringERK6StringRK6String