clipboard.min.js not found

Created by: abc874

Version 2.1.18

/plugin_file.php?file=BBCodePlus/prism/clipboard.min.js in prism.js throws

"GET /plugin_file.php?file=BBCodePlus/prism/clipboard.min.js HTTP/1.1" 404 196 in Apache access.log

and

script 'xxxxx/mantisroot/plugin_file.php' not found or unable to stat in Apache error.log