How do I diagnose a plugin resource 404?

I have the feeling that either those files don’t exist or the location of the file has changed.

Go into /plugins/wp-greet-box/js/ and see if you can locate the functions.js and the jquery.js. If the files are not there then they must have been deleted and that is why it’s throwing the 404 (Not found).

EDIT: Also I would remove some Plugins as a lot of Plugins can cause the page to load slow ect…