the problem is case sensitivity.
you have a folder in your site named "JS". the CMS install added a number of files to that folder, but the CMS code is expecting the folder to be name "js" (lower case). since your is a unix server, the case of the folder name maters.
you will need to change that name of that folder to lower case "js" and update your pages that use scripts in that folder to use the lower case folder name.