Hi Jaikumar,
AFAICS the problem you're facing is that the d-i kernel modules and
the kernel you're running don't match up. Here's the kernel version
you have:
them updating *some* of the installer (i.e. the modules in the DebianThe most common cause of this kind of problem for people netbooting is
archive) without also updating the kernel that's being served by
tftp. Please go and check that...