help me remove that error

Arduino: 1.8.1 (Windows 8), Board: “Arduino/Genuino Uno”

C:\Users\SETH PC\Desktop\correct_nbr2\correct_nbr2.ino:2:18: fatal error: DHT22.h: No such file or directory

#include<DHT22.h>

^

compilation terminated.

exit status 1
Error compiling for board Arduino/Genuino Uno.

This report would have more information with
“Show verbose output during compilation”
option enabled in File → Preferences.//

//#include <DHT_U.h>
#include<DHT22.h>
#include<LiquidCrystal.h>
#define DHTPIN 22// what pin we’re connect to
#define DHTTYPE DHT11
DHT dht (DHTPIN, DHTTYPE);
LiquidCrystal lcd(8,9,4,5,6,7);
void setup(void)
{
lcd.begin(16,2);
lcd.print(“Reading sensor”);
dht.begin();
}
void loop()
{
float temperature,humidity;
humidity=dht.readHumidity();
temperature=dht.readTemperature();
delay(2000);
lcd.clear();
char tempF[6];
char humF[6];
dtostrf(temperature,5,1,tempF);
dtostrf(humidity,2,0,humF);
lcd.print(“T:”);
lcd.print(tempF);
lcd.print((char)223);
lcd.print(“c”);
lcd.print(“H:”);
lcd.print(humF);
lcd.print("&");
}

fatal error: DHT22.h: No such file or directory

If you haven't downloaded the library, why on earth are you trying to use it?

Do you go to the grocery store, to find that they are out of meatballs, but plan spaghetti with meatballs for dinner anyway?

Hello Bisimwa.
PaulS is correct. As a newbie myself, I understand your next question- "where do I get a library?"

1.) On your IDE programmer, goto Sketch/Include Library/Manage Libraries.
2.) Type "DHT22" into the textbox.
3.) Click "More Info".
4.) Click the "Install" button.
5.) Close IDE programmer
6.) Re-execute IDE programmer (reloads new libraries).
7.) Re-open sketch.

Recompile.
Done.

JMeller:
3.) Click "More Info".

This is a common misconception. It does work to click "More info" but actually clicking anywhere on the entry for the library works, there's nothing special about "More info". After clicking anywhere on the library entry you can click "More info" to be taken to the website specified by the library author if you like.

JMeller:
5.) Close IDE programmer
6.) Re-execute IDE programmer (reloads new libraries).
7.) Re-open sketch.

Those last three steps are not necessary with any relatively recent version of the Arduino IDE.