i want to run main class and then i got this on my terminal, but when i run this code in intelliJ it work theres no error. can you guys help me?

Main.java:3: error: package data does not exist
import data.Admin;
           ^
Main.java:4: error: package data does not exist
import data.Student;
           ^
Main.java:9: error: cannot find symbol
    Admin admin = Admin.getInstance();
    ^
  symbol:   class Admin
  location: class Main
Main.java:9: error: cannot find symbol
    Admin admin = Admin.getInstance();
                  ^
  symbol:   variable Admin
  location: class Main
Main.java:41: error: cannot find symbol
        Student foundStudent = null;
        ^
  symbol:   class Student
  location: class Main
Main.java:43: error: cannot find symbol
        for (Student student : admin.studentList) {
             ^
  symbol:   class Student
  location: class Main
6 errors

i run that program on intelliJ it work, but when i run in vscode i got that error message