java.lang.ClassCastException

Boa tarde Professor

Tive que mudar a versão do Spring Boot e antes minhas invocacoes funcionavam normalmente, agora esta dando java.lang.ClassCastException nessa invocacao em negrito:

@Autowired
    private TradePhoneService service;

    @CrossOrigin(origins = {"http://localhost:4200","http://localhost:8081"})
    @PostMapping(value = "/listarRamaisDiponiveis", produces = "application/json")
    public ResponseEntity <List<TpbPrvtRecPhoneExtVO>> listarRamaisDiponiveis() {
        List<TpbPrvtRecPhoneExtVO> list = new ArrayList<>();

        try {

        **    list =service.listarRamaisDiponiveis();**

Sobre a classe TpbPrvtRecPhoneExtVO:

public class TpbPrvtRecPhoneExtVO extends BaseVO implements Serializable{

    ----Sobre a interface TradePhoneService:

package com.citibank.spring.service;

import java.util.List;

import com.citibank.spring.model.TpbPrvtRecPhoneExtVO;

public interface TradePhoneService { public List listarRamaisDiponiveis();

public TpbPrvtRecPhoneExtVO listarRamalUsuario(String soeid); public TpbPrvtRecPhoneExtVO gravar(TpbPrvtRecPhoneExtVO vo);

}

--E sobre a classe que implementa a interface TradePhoneService:

    @Transactional(rollbackOn=Exception.class)
@Service
public class TradePhoneServiceImpl implements TradePhoneService {
    @Autowired
    private TradePhoneDAO dao;

    public List<TpbPrvtRecPhoneExtVO> listarRamaisDiponiveis() {
        return listBeansToVos(dao.listarRamaisDiponiveis());
    }

O que pode ser?

Obrigado