Category editor not displaying properly

Hi,
I am using this theme: https://adforest.scriptsbundle.com/
and added category editor plugin as I wanted to add description on ad categories.
But the editor is showing incomplete menu: https://snipboard.io/DVPFuS.jpg
(for ex, table is not there) and the output is not displaying correctly.
Secondly it shows following errors in various fields
https://snipboard.io/WxeAtB.jpg
pls help me resolve this

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