本地可以运行，但是放到oj上总显示运行错误，请问是什么原因？

import java.io.*;
import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);


        try(ObjectInputStream ois=new ObjectInputStream(new FileInputStream("dic.dic"));){
            int n = sc.nextInt();
            List<Book> bookList = new ArrayList<>();
            for (int i = 0; i < 5; i++) {
                Book book=(Book)ois.readObject();
                bookList.add(book);
            }
            System.out.println(bookList.get(n-1).toString());
        } catch (ClassNotFoundException | IOException e) {
            throw new RuntimeException(e);
        }
    }
}


class Person implements Serializable{

    @Serial
    private static final long serialVersionUID = 1L;
    private String name ;
    private String gender ;
    private LocalDate birthday ;
    private String biography ;

    public Person() {

    }

    public Person(String name , String gender , String biography ,
                  int year , int month ,int day) {
        this.name = name ;
        this.gender = gender ;
        this.biography = biography ;
        this.birthday = LocalDate.of(year , month , day) ;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public LocalDate getBirthday() {
        return birthday;
    }
    public void setBirthday(LocalDate birthday) {
        this.birthday = birthday;
    }
    public String getBiography() {
        return biography;
    }
    public void setBiography(String biography) {
        this.biography = biography;
    }

    @Override
    public String toString() {
        return "name: " + name + " , gender: " + gender + " , birthday: "
                + birthday + " , biography: " + biography ;
    }

}



class Book implements Serializable {

    private static final long serialVersionUID = 1L;

    private String name;
    private Person author;
    private int price;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Person getAuthor() {
        return author;
    }

    public void setAuthor(Person author) {
        this.author = author;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public Book() {

    }

    public Book(String name, Person author, int price) {
        this.name = name;
        this.author = author;
        this.price = price;
    }

    @Override
    public String toString() {
        if (author != null) {
            return "name: " + name + "\nauthor: " + author + "\nprice: " + price;
        }
        return null;
    }
}

是dict.dic不是dic.dic