sijax register_upload_callback 传递参数问题

在使用sijax 上传文件时 弹出错误 “you tried to perform an action in a wrong way”，请大神解答下什么原因，我只想在registeruploadcallback 时传递自己参数,当去除参数 argsextra=(2,2,) 时就正常。请问 argsextra 参数怎么传递?

---

    def my():
    form_init_js = ''
    form_init_js += g.sijax.register_upload_callback(form_id ='fmAvatar',callback =AjaxAvatarUpload.file_handler,args_extra=(2,2,))

    if g.sijax.is_sijax_request:
        print('ajax')
        #call_test_callbacks(g)
        return g.sijax.process_request()

    if request.method == "POST":
        _email = request.form.get("email")
        _gender = request.form.get("gender")

        current_user.email = _email
        current_user.gender = _gender
        current_user.save()
        return render_template("info.html",title=u"提示信息",info=(u"保存成功",),link=request.path)

    return render_template("my.html",form_init_js=form_init_js)

---

ALLOWED_EXTENSIONS = set(['txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif'])

class AjaxAvatarUpload(object):
    """
    """

    @staticmethod
    def file_handler(obj_response, files, form_values):

        tipMsg =""
        if 'file' not in files:
            tipMsg = 'Bad upload'

        file_data = files['file']
        file_name = file_data.filename
        if file_name is None:
            tipMsg = 'Nothing uploaded'

        file_type = file_data.content_type
        file_size = len(file_data.read())
        if file_size > current_app.config['UPLOAD_FOLDER_AVATAR']:
            tipMsg = u"文件大小超过2MB"
            #obj_response.html('#%s' % container_id, tipMsg)

        if not AjaxAvatarUpload.allowed_file(file_data.filename):
            tipMsg = u"不允许的文件类型"
            #obj_response.html('#%s' % container_id, tipMsg)

        filename = secure_filename(file_data.filename)

        file_data.save(os.path.join(current_app.config['UPLOAD_FOLDER_AVATAR'], filename))
        obj_response.html("#formTwoResponse", tipMsg)
        return


    @staticmethod
    def allowed_file(filename):
        return '.' in filename and \
               filename.rsplit('.', 1)[1] in ALLOWED_EXTENSIONS