Bean property is not readable or has an invalid getter method

Boa tarde Pessoal,

Estou utilizando um método GET para um formalário, mas estou tendo como retorno o seguinte erro: org.springframework.beans.NotReadablePropertyException: Invalid property 'deliverables' of bean class [br.com.rs.model.Report]: Bean property 'deliverables' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?

Controller

@GetMapping("/terms")
    public ModelAndView terms() {
        ModelAndView modelAndView = new ModelAndView("pages/terms");

        modelAndView.addObject("report", new Report());
        modelAndView.addObject("reports", reportService.findAll());
        modelAndView.addObject("deliverables", deliverableRepository.findAll());
        modelAndView.addObject("documents", documentRepository.findAll());

        return modelAndView;
    }

Repository

@Repository("deliverableRepository")
public interface DeliverableRepository extends JpaRepository<Deliverable, Long> {

}

Models

@Entity
@Table(name = "report")
public class Report {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;
    private String client;
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    @Temporal(TemporalType.DATE)
    private Calendar homolog;
    private String contact;
    @ManyToOne
    private User user;
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    @Temporal(TemporalType.DATE)
    private Calendar golive;
    private String id_crm;
    @ManyToMany(cascade = {CascadeType.PERSIST,CascadeType.MERGE})
    @JoinTable(name = "report_deliverable", joinColumns = @JoinColumn(name = "report_id"), inverseJoinColumns = @JoinColumn(name = "deliverable_id"))
    // Motivo de usar set: https://vladmihalcea.com/the-best-way-to-use-the-manytomany-annotation-with-jpa-and-hibernate/
    private Set<Deliverable> deliverables = new HashSet<>();

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getClient() {
        return client;
    }

    public void setClient(String client) {
        this.client = client;
    }

    public Calendar getHomolog() {
        return homolog;
    }

    public void setHomolog(Calendar homolog) {
        this.homolog = homolog;
    }

    public String getContact() {
        return contact;
    }

    public void setContact(String contact) {
        this.contact = contact;
    }

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public Calendar getGolive() {
        return golive;
    }

    public void setGolive(Calendar golive) {
        this.golive = golive;
    }

    public String getId_crm() {
        return id_crm;
    }

    public void setId_crm(String id_crm) {
        this.id_crm = id_crm;
    }

    public void addDeliverable(Deliverable deliverable) {
        deliverables.add(deliverable);
        deliverable.getReports().add(this);
    }

    public void removeDeliverable(Deliverable deliverable) {
        deliverables.remove(deliverable);
        deliverable.getReports().remove(this);
    }
}

@Entity
@Table(name = "deliverable")
public class Deliverable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;
    private String deliverable;
    @ManyToMany(mappedBy = "deliverables")
    private Set<Report> reports = new HashSet<>();

    public Deliverable() {}

    public Deliverable(String deliverable) {
        this.deliverable = deliverable;
    }

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getDeliverable() {
        return deliverable;
    }

    public void setDeliverable(String deliverable) {
        this.deliverable = deliverable;
    }

    public Set<Report> getReports() {
        return reports;
    }

    public void setReports(Set<Report> reports) {
        this.reports = reports;
    }
}

Select onde gera o erro:

<select class="form-control select2 select2-hidden-accessible" th:field="*{deliverables}" multiple="" data-placeholder="Selecione os entreg�veis" style="width: 100%;" tabindex="-1" aria-hidden="true">
                                                    <option th:each="deliverable : ${deliverables}" th:text="${deliverable.deliverable}" th:value="${deliverable.id}" ></option>
                                                </select>