I am very new at coding, can you help me understanding what this error means? Thank you
#include <AFMotor.h>
AF_DCMotor motor1(1, MOTOR12_64KHZ);
motor1.setSpeed(255);
void loop() {
motor1.run(FORWARD);
delay(1000);
motor1.run(BACKWARD);
delay(1000);
motor1.run(RELEASE);
delay(1000);
}