Hi Konstantinos, thanks for your answer. I have changed the directory as the update suggest (what seems rare to me because i had the directory as the wiki originally suggest and everything about compiling and running programs works perfect, the one thing doesn't work is debugging, but i have changed cause it still works) but unfortunately the error continues (I think because the debugging configuration still remains equal, due to the change of directory was concern to the builder not the debugger).
I have a question about debugging in eclipse with ns3: because i imagine that it works with the eclipse button as normal debugging but i'm not sure because maybe it could be that in the console window appears the gdb commands?? (because of i have never seen the debugging working in eclipse with ns3 i don't know how it works) Do you know how does it work?
the error still is : error while loading shared libraries: libns3-aodv.so.3: cannot open shared object file: No such file or directory
Note: The most rare thing is that if i look in the directory the library does exits!!!!!