DHT22 sensor

Hello

Thank you for reading and help to solve my Problem

I Want to use the DHT 22 Sensor to get temperature and humidity My sketch includes the library but shows overtime the following error message:

Users/alex/Documents/Arduino/libraries/DHT22/DHT22.cpp:47:24: fatal error: WConstants.h: No such file or directory

include “WConstants.h”

Arduino.h, not WConstants.h.