I uploaded a program to serverA, and it works fine. Recently I uploaded it to ServerB, but it doesn't work fine.

On ServerB, the program is online, and I can access the admin area, but once in admin function, I can't do anything else. It shows me the admin menu, but no matter what I click on, it just stays at the menu.

I have been using the program on ServerA for quite a while, so I know the program well. I just can't figure out what's wrong with ServerB. I know very little programming, so have no way to diagnose the problem. Running this program is the only reason I got more hosting, so I hope I can make this work.