How to connect Arduino NodeMCU esp8266 with Firebase

hai all,,,, i have project IOT make a NodeMCU esp8266 with firebase but error.

In file included from C:\Users\Sankala\Documents\Arduino\libraries\firebase-arduino-master\src/Firebase.h:30:0,

from C:\Users\Sankala\Documents\Arduino\libraries\firebase-arduino-master\src/FirebaseArduino.h:22,

from C:\Users\Sankala\Documents\Arduino\NodeMCU8266\NodeMCU8266.ino:5:

C:\Users\Sankala\Documents\Arduino\libraries\firebase-arduino-master\src/FirebaseObject.h:109:11: error: StaticJsonBuffer is a class from ArduinoJson 5. Please see Redirecting… to learn how to upgrade your program to ArduinoJson version 6

std::shared_ptr<StaticJsonBuffer<FIREBASE_JSONBUFFER_SIZE>> buffer_;

^

In file included from C:\Users\Sankala\Documents\Arduino\libraries\firebase-arduino-master\src/FirebaseArduino.h:22:0,

from C:\Users\Sankala\Documents\Arduino\NodeMCU8266\NodeMCU8266.ino:5:

C:\Users\Sankala\Documents\Arduino\libraries\firebase-arduino-master\src/Firebase.h:86:11: error: StaticJsonBuffer is a class from ArduinoJson 5. Please see Redirecting… to learn how to upgrade your program to ArduinoJson version 6

std::shared_ptr<StaticJsonBuffer<FIREBASE_JSONBUFFER_SIZE>> buffer_;

^

exit status 1
Error compiling for board NodeMCU 1.0 (ESP-12E Module).

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

thank's...