Topic on Extension talk:Cite

I am having errors with the Extension:CITE. Any suggestions why?

Photo:

https://imgur.com/a/huQOWPD

Hard to tell. A file with the name Cite_body.php doesn't exist any more since 2016, MediaWiki version 1.28. My best guess is an incompatibility where the MediaWiki base software was upgraded, but not the extension. Please refer to Manual:Upgrading to get help upgrading your server. Manual:Security explains why this is important.