unable to add modules

I am currently installing OpenMRS on ubuntu OS . After installing I am unable to add modules in the OpenMRS. I also done by putting the files into modules folder still no luck

If i Click on Add On Manager . It shows like this

HTTP Status 404 – Not Found

Type Status Report

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

Can you share your server side logs via pastebin.com?