thymeleaf报错TemplateProcessingException: Exception evaluating SpringEL expression

<div class="media" th:each="question : ${pageInfo.list}">
                <div class="media-left">
                    <a href="#">
                        <img class="media-object img-rounded" style="height: 38px;width:38px;"  th:src="${question.user.headpic}">
                    </a>
                </div>
                <div class="media-body">
                    <h4 class="media-heading" th:text="${question.title}"></h4>
                    <span th:text="${question.description}"></span><br>
                    <span class="text-desc" style="font-size:12px;font-weight: normal;color: #999 "><span th:text="${question.commentCount}"></span>个回复 ·<span
                            th:text="${question.viewCount}"></span>次浏览 · <span th:text="${#dates.format(question.getCreateTime(),'yyyy-MM-dd HH:mm:ss')}"></span></span>
                </div>
            </div>