Strange errors when checking a page with a SEO Spider

JavaScript
1

On a website I am working on I get an error as below for all included js files:

 ../it/js/slideshow.js    text/html; charset=iso-8859-1    404      Not Found

I have never seen this. Does someone know why/what this is and what I can do about it? Website has charset utf-8

2

Hi donboe,

404 means missing, as in not there.

Could you post a link to the site in question?