ajax上传图片jsp代码为什么抛出异常Type mismatch: cannot convert from SmartFile to File?

ajax上传图片代码实例如下：其中黄色的一段总是在报错；报错内容：

Multiple annotations found at this line:
    - Type mismatch: cannot convert from SmartFile 
     to File
    - Type mismatch: cannot convert from SmartFile 
     to File

哪位大神可以解决一下的吗？

<%@ page language="java" contentType="text/html; charset=gb2312" %>
<%@ page import="com.jspsmart.upload.SmartUpload"%>
<jsp:useBean id="myUpload" scope="page" class="com.jspsmart.upload.SmartUpload"></jsp:useBean>
<% 
    String FileName = null;
    long SlaveSize = 0;
    myUpload.initialize(pageContext);
    myUpload.upload();
    java.util.Enumeration e=myUpload.getRequest().getParameterNames();
    String path= request.getRealPath("img");
    try{
    com.jspsmart.upload.File myFile =myUpload.getFiles().getFile(1);
    FileName = myFile.getFileName();
    FileName = new String(FileName.getBytes("iso-8859-1"),"utf-8");
        SlaveSize = myFile.getSize();
        String ReName = System.currentTimeMillis()+SlaveSize+"."+myFile.getFileExt(); //文件重命名
        String alphaPt = path+"/"+ReName;
        myFile.saveAs(alphaPt);//上传保存文件
        out.println("{msg:'文件上传成功!!!',url:'./img/"+ReName+"'}");
    } catch (Exception ex) {
        out.println("{msg:'文件上传失败!!!'}");
    }
%>