文件上传时出现如下异常,请教是什么原因

文件上传时出现如下错误,请问是什么原因?
代码:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN ">
<HTML>
<HEAD>
<TITLE> 栏目添加 </TITLE>
<META NAME= "Generator " CONTENT= "EditPlus ">
<META NAME= "Author " CONTENT= " ">
<META NAME= "Keywords " CONTENT= " ">
<META NAME= "Description " CONTENT= " ">
</HEAD>
<%@page contentType= "text/html;charset=GBK "%>
<%@page language= "java " import= "com.jspsmart.upload.* "%>
<%@page import= "java.util.*,java.sql.*,java.text.*,java.sql.Date "%>
<jsp:useBean id= "db " class= "bean.ConnDB " scope= "session "/>
<jsp:useBean id= "mySmartUpload " scope= "page " class= "com.jspsmart.upload.SmartUpload "/>

<BODY>
<%
request.setCharacterEncoding( "GBK ");
SimpleDateFormat formatter_f=new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss ");
java.util.Date now=new java.util.Date();

mySmartUpload.initialize(pageContext);
mySmartUpload.upload();

com.jspsmart.upload.File myFile=mySmartUpload.getFiles().getFile(0);
String GetNewID=formatter_f.format(now).substring(0,4)+formatter_f.format(now).substring(5,7)+formatter_f.format(now).substring(8,10)+formatter_f.format(now).substring(11,13)+formatter_f.format(now).substring(14,16)+formatter_f.format(now).substring(17)+myFile.getFileName();
//如果文件存在，则保存
if(!myFile.isMissing()){
myFile.saveAs( "upload/ "+GetNewID);
}
String bt=mySmartUpload.getRequest().getParameter( "classname ");

try{
String strUpd= "INSERT INTO SPecialS (SName) VALUES( ' "+bt+ " ', ' "+GetNewID+ " ') ";
db.executeUpdate(strUpd);
response.sendRedirect( "saveclass.jsp ");
db.close();
}
catch(Exception e){System.err.print(e);}
%>
</BODY>
</HTML>

------解决方案--------------------
用APACHE的Commons FileUpload吧？那个JSPSmartUpload太麻烦，功能也不强大啊！

文件上传时出现如下异常,请教是什么原因

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