#include<ArduinoJson.h> getting error of no such file

Created by: rickmoua

I ran the example "JsonServer" which has the #include<ArduinoJson.h> and got this error below: JsonServer.ino:7:25: fatal error. ArduinoJson.h: no such file or directory compilation terminated.

I download the version 5.0.2.zip from here https://github.com/bblanchon/ArduinoJson/releases extracted and put in /sketchbook/libraries/ArduinoJson.

Not sure why getting the error. Any advise is appreciated.