[Hibernate] A Foreign key has the wrong number of column. should be 0

@Entity
@Table(name = "users")
public class User {
    @Id
    @GeneratedValue
    @Column(name = "id")
    private int id;
 
    @Column(name = "email")
    private String email;
 
    @Column(name = "full_name")
    private String fullName;
 
    @Column(name = "username")
    private String username;
 
    @Column(name = "password")
    private String password;
 
    @ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinTable(name = "user_roles", joinColumns = @JoinColumn(name = "user_id"),
            inverseJoinColumns = @JoinColumn(name = "role_id"))
    private Set<Role> roles = new HashSet<>();
 
    // constructor & getters-setters
}

@Entity
@Table(name = "teachers")
public class Teacher {
    @Id @GeneratedValue(strategy = GenerationType.AUTO)
    @OneToOne
    @JoinColumn(name = "id")
    private User user;
 
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "teacher")
    private Set<Subject> subjects = new HashSet<>();
 
    @OneToMany(mappedBy = "teacher")
    private Set<Student> students = new HashSet<>();
 
    @OneToMany(mappedBy = "teacher")
    private Set<Problem> problems = new HashSet<>();
 
    // constructor & getters-setters
}

@Entity
@Table(name = "problems")
public class Problem {
    @Id @GeneratedValue
    @Column(name = "id")
    private int id;
 
    @ManyToOne
    @JoinColumn(name = "teacher_id")
    private Teacher teacher;
 
    @Enumerated(EnumType.ORDINAL)
    @Column(name = "problem_status_id")
    private ProblemStatus problemStatus;
 
    @Column(name = "start_date")
    @Type(type = "date")
    private Date startDate;
 
    @Column(name = "due_date")
    @Type(type = "date")
    private Date dueDate;
 
    @Enumerated(EnumType.ORDINAL)
    @Column(name = "complexity_status_id")
    private ProblemComplexity problemComplexity;
 
    @Column(name = "subject")
    private String subject;
 
    @Column(name = "title")
    private String title;
 
    @Column(name = "description")
    private String description;
 
    @Column(name = "customer_info")
    private String customerInfo;
 
    @Column(name = "payment_in_dollars")
    private int paymentInDollars;
 
    // constructor & getters-setters
}

    @ManyToOne
    @JoinColumn(name = "teacher_id")
    private Teacher teacher;

    @OneToMany(mappedBy = "teacher")
    private Set<Problem> problems = new HashSet<>();