[play-framework] How To Solve : Could Not Find BeanDescriptor For Class????

I got this error when I change one of my ebean model classes!! how can I 
solve it??
1) Error injecting constructor, javax.persistence.PersistenceException: 
Could not find BeanDescriptor for class models.ProductOrder. Perhaps the 
EmbeddedId class is not registered? 
this is my class:
package models;
import com.avaje.ebean.Model;
import com.avaje.ebean.annotation.CreatedTimestamp;
import javax.persistence.*;
import java.sql.Timestamp;
import java.util.List;
@Entity
public class ProductOrder extends Model {
    @Id
    String uuid;
    @Column(columnDefinition = "datetime")
    @CreatedTimestamp
    public Timestamp createdAt;
    @ManyToOne
    Customer customer;
    @ManyToOne
    Payment payment;
    @ManyToOne
    Store store;
    @OneToMany(cascade = CascadeType.ALL)
    List orderDetailsList;
    public static Finder find = new Finder(ProductOrder.class);
    public String getUuid() {
        return uuid;
    }
    public void setUuid(String uuid) {
        this.uuid = uuid;
    }
    public Customer getCustomer() {
        return customer;
    }
    public void setCustomer(Customer customer) {
        this.customer = customer;
    }
    public Payment getPayment() {
        return payment;
    }
    public void setPayment(Payment payment) {
        this.payment = payment;
    }
    public Timestamp getCreatedAt() {
        return createdAt;
    }
    public void setCreatedAt(Timestamp createdAt) {
        this.createdAt = createdAt;
    }
    public Store getStore() {
        return store;
    }
    public void setStore(Store store) {
        this.store = store;
    }
    public List getOrderDetailsList() {
        return orderDetailsList;
    }
    public void setOrderDetailsList(List orderDetailsList) {
        this.orderDetailsList = orderDetailsList;
    }
}
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