Lesson 9: Servo

Hi all!

I just started Arduino recently, But I cannot correctly upload a code to arduino:
i just opened the lesson 9: servo file and tried to compile, it does not raise any erors, but nothing is moving.
I double checked the wires, but nothing.
I also tried to include servo.h on a new tab, but nothing.

CODE:
//www.elegoo.com
//2016.12.08
#include <Servo.h>

Servo myservo; // create servo object to control a servo
// twelve servo objects can be created on most boards

int pos = 0; // variable to store the servo position

void setup() {
myservo.attach(9); // attaches the servo on pin 9 to the servo object
}

void loop() {
for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
// in steps of 1 degree
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
}

But I cannot correctly upload a code to arduino

So, you must have error messages.

Please post them.

Please remember to use code tags when posting code