error while building kernel image deb with kpkg

["Nagarjuna G." <nagarjun@hbcse.tifr.res.in>]

I get the following error while compiling the kernel-image using
make-kpkg.  Any idea where the script is going wrong.  I had built
kernels before, and it worked.  

---------error lines-------
cp vmlinux debian/tmp-image/boot/vmlinux-2.4.25-ben1
chmod 644 debian/tmp-image/boot/vmlinux-2.4.25-ben1
cp arch/ppc/boot/images/vmlinux.coff  
debian/tmp-image/boot/vmlinux.coff-2.4.25-ben1
cp: cannot stat `arch/ppc/boot/images/vmlinux.coff': No such file or
directory
make[1]: *** [real_stamp_image] Error 1
make[1]: Leaving directory `/usr/src/benh-kernel'
make: *** [kernel-image-deb] Error 2
-------error lines end ----------

Nagarjuna