Codezwiz >> Forums >> General PHP Nuke Help >> Can't add files for Download module (NSN Group Download)

I'm new with phpNuke, and sorry for my poor English language, but I'll try my best to describe my problem.

I installed phpNuke 7.8 with patched 3.2,
and installed NSN Groups 171 -- that's fine, no problem. I can create member groups as I want.

Then I installed NSN Group Download_760_102a (as I would like to allow only specified groups of members to download only).
The problem is: The files aren't added to the system. When I add files to download, the system is silent, nothing happen and no files have been added. I also can't add description in the box (see picture at: [ Register or login to view links on this board. ] ).
There is also error message at the corner on the left of browser, 'Error on page'.

I would like to know how or what I should do to solve this problem?
or what modules should I use?
or how can I do to allow only specified groups of members to download?

Thank you very much for your help. I do really have no idea how to solve it.