Translate the English you read/receive into Indonesian.
Where do you find these libraries?
#include "I2Cdev.h"
#include <PID_v1.h>
#include "MPU6050_6Axis_MotionApps20.h"
I2Cdev.h seems to be resident in the IDE.
This file: PID_v1.h seems to now be PID_v1_bc.h
MPU6050_6Axis_MotionApps20 does not seem to exist (but you have it, or you could not compile your sketch).
The teacher teaches you more than you need to know. Your job as a student is to listen to your teacher. The problem is not the teacher.