مشكلة عند تعديل itemmenu في اللغة

هنا الصورة توضح المشكل

https://djoudi.net/img/lang.png

هذا في console

Uncaught Error: Invalid dimensions for plot, width = null, height = null
    at Canvas.resize (jquery.flot.js:135)
    at new Canvas (jquery.flot.js:114)
    at setupCanvases (jquery.flot.js:1313)
    at new Plot (jquery.flot.js:707)
    at Function.$.plot (jquery.flot.js:3146)
    at dashboard.js:50
    at dashboard.js:176
1:768 Object
/en/admin/updateOneMenuItem Failed to load resource: the server responded with a status of 405 (Method Not Allowed)