I keep getting an error message and I don't know how to fix it

Question

I am using an Arduino Genuino, this is what comes up

Multiple libraries were found for "LiquidCrystal.h"
 Used: /home/user/Arduino/libraries/LiquidCrystal
 Not used: /opt/ArduinoIDE/libraries/LiquidCrystal
In file included from /home/user/Arduino/libraries/dht/DHT_U.cpp:22:0:
/home/user/Arduino/libraries/dht/DHT_U.h:25:29: fatal error: Adafruit_Sensor.h: No such file or directory
 #include <Adafruit_Sensor.h>

                             ^
compilation terminated.
exit status 1

Answer 1

The first notice about multiple libraries is not stopping you. The DHU library relies on the Adafruit Unified Sensor Library

You should have the following libraries (installed and) included:

#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>