DHT library error

I am trying to use Portable Arduino Temp/Humidity Sensor with LCD

I am getting following error.

In file included from D:\Summer 2017\Arduino\LCD_DHT11\LCD_DHT11.ino:2:0:

C:\Users\Neeraj Mahajan\Documents\Arduino\libraries\DHT-sensor-library-master/DHT_U.h:25:29: fatal error: Adafruit_Sensor.h: No such file or directory

#include <Adafruit_Sensor.h>

^

compilation terminated.

Multiple libraries were found for "DHT.h"
Used: C:\Program Files (x86)\Arduino\libraries\DHT
Not used: C:\Users\Neeraj Mahajan\Documents\Arduino\libraries\DHT-sensor-library-master
exit status 1
Error compiling for board Arduino/Genuino Uno.

Why is the fact that you have not downloaded, or properly installed, the Adafruit_Sensor library a "DHT library error"? Looks more like a PEBKAC error, to me.