Symantec Backup exec 12.5 Help

Symantec Backup exec 12.5 on windows 2008 with a robotic tape library fujitsu  eternus 120

i have isntall the software and licenses , follow the steps created the jobs but they allways fail, is like the program and the tape unit don comunicate and i'm useing the recomended drivers just how it sys in the isntalatio, in a inventory just stais there without end