Kendo UI Grid：更新/保存无法正常工作（_AntiForgeryToken不存在）

I have a KENDO grid that displays contract attachments, which has a column 'Status'. In that column the current status of the attachment/contract is displayed. When invoking the 'Edit' event a combobox appears in the cell with all available status options. After selecting a status and clicking the "update" button, I get the following exception:I have a KENDO grid that displays contract atta