php – Nicedit本地上传图片失败

new nicEditor({
           buttonList : ['bold','italic','underline','upload'],iconsPath:'img/nicedit.png',uploadURI : 'http://server.com/integracion/files/nicUpload.php'
}).panelInstance(textareaId);

并且.php文件存在(我是Docs中的那个,我更新了目标路径)

/* I want them here http://server.com/integracion/files/uploads/ so... */   
    define('NICUPLOAD_PATH','./uploads'); // Set the path (relative or absolute) to
                                              // the directory to save image files                  
    define('NICUPLOAD_URI','/uploads');   // Set the URL (relative or absolute) to
                                              // the directory defined above

但是我在上传完成时做出响应(以及从nicedit中提取警告……)

<script>
        try {
            top.nicUploadButton.statusCb({"error":"Invalid Upload ID"});
        } catch(e) { alert(e.message); }
    </script>

我错过了什么？

-编辑

我认为问题可能出在php文件中：

$id = $_POST['APC_UPLOAD_PROGRESS'];  /* APC is installed and enabled */
if(empty($id)) {
    $id = $_GET['id'];
}