The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.
the error is reported directly on the display page after the picture is uploaded. The following is the code for reporting the error
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<div align="center"><h1><b><font color="red"></font></b><%=request.getAttribute("uploadResult") %></h1></div>
</body>
</html>