HI Everyone,
I finally got around the problem, but not with the help from Backup Exec Support Team, but all by my own.
First of all, I want to point out that some "Helpers" from this forum are very annoying, such as Priya Khire, which is a Veritas Employee, although the article of 192055 and 252430 are exactly the same thing, he still post it out and claiming it might be helpful to me, which I think is totally rubbish. May be they have to answer certain number of questions everyday, so just put these kinds of craps in, to meet their daily quota. However, I see it happen to so many other posts and I do not appreciate of "Help" like this.
Anyway, here is how I fix it. FYI, I am running version 5484.
1. download kb 277417 and install the hotfix.
2. run the tapeinst.exe from C:\Program Files\VERITAS\Backup Exec\NT and reinstall all the drivers for your tape drives, make sure you choose backup exec driver for all your tape drives.
I do not know which one actually fixed my problem, since I did one after the other, but somehow I think it is more to do with the reinstall of the Tape drive drivers, if there is new robotic library available for your backup exec, it makes sense to install the update before reinstall all of your drivers.
Hope it is going to help for people who is struggling to get rid of the stuppid message as I did, and I encourage people to put their solution on the forum to help all other who are relying on the "Great" support from Veritas support team.
Cheers
Roy