EL表达式嵌套问题，嵌套报错，希望大神帮忙看看，贴上代码

Question

<div class="col-xs-2"> <select id="chapterType" name="chapterType" class="form-control" > <c:forEach items="${chapterType}" var="cType" > <option value="${cType.id}" <c:if test="${chapter.chapterType==${cType.id}}">selected = selected</c:if>> ${cType.name} </option> </c:forEach> </select> </div>