plupload error generation - php

Question

I am trying to solve a problem with plupload where i show an error in the upload window, generated by upload.php. No matter what i do, i am not able to create the error icon in the window. Although the alerts work fine, the file is always marked as success. Can someone please tell me what am i doing wrong here?
The error from my upload.php is die('{"jsonrpc" : "2.0", "error" : {"code": 500, "message": "File upload failed."}, "id" : "id"}');
And this is the javascript:
// Convert divs to queue widgets when the DOM is ready
$(function() {
// Setup html5 version
$("#html5_uploader").pluploadQueue({
// General settings
runtimes : 'html5',
url : 'upload.php',
max_file_size : '2000mb',
chunk_size : '1mb',
unique_names : false,
// Specify what files to browse for
filters : [
{title : "Video Clips", extensions : "mov,avi,mpg,flv,mp4"},
{title : "Audio Files", extensions : "mp3,wav"},
{title : "Executable Files", extensions : "exe"},
{title : "Zip Files", extensions : "zip,rar"}
],
preinit: attachCallbacks
});
// attach callbacks for FileUploaded and Error
function attachCallbacks(uploader) {
uploader.bind('FileUploaded', function(up, file, response) {
response = jQuery.parseJSON( response.response );
alert(response.error.code);
if (response.error.code == '500') {
alert (response.error.message);
//alert (file.id);
$('#' + file.id).attr('class', 'plupload_failed').find('a').css('display', 'none').attr('title', response.error.message);
file.status = plupload.FAILED;
} else {
alert("yoohoo");
$('#' + file.id).attr('class', 'plupload_done').find('a').css('display', 'none').attr('title', 'Success');
file.status = plupload.DONE;
}
});
}
});
Thanks.

Answer 1

In case anyone else is looking for the solution to this, it's here: http://www.plupload.com/punbb/viewtopic.php?id=1710
The problem is that you're using the FileUploaded event inside the preinit section. You should bind your event on the init section.
(answer from LeandroJF)