got error during running bootcdwrite

Hi,
   I am using ubuntu host system. I am trying to make bootcd of my
running distribution with bootcdwrite command. Whwn i typed
bootcdwrite in the terminal as root user. The output is like-

root@shamim:/home/muhammad# bootcdwrite
To see full output: tail -f /var/log/bootcdwrite.log
--- Checking for possible Problems ---
 /var will be cleaned (apt-get clean) !

Ok to continue? (y/n) y

--- Cleanup ---
22220 blocks
--- Sizes in KByte (du -klsc ) ---
NOT_TO_CD =  . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
CD_ALL (SRCDISK v NOT_TO_CD) = . . . . . . . . . . . . . . . . . . 1672692
Needed = CD_ALL - NOT_TO_CD  . . . . . . . . . . . . . . . . . . . 1672692
CD (650 MB) =  . . . . . . . . . . . . . . . . . . . . . . . . . . 665600
because of compression perhaps double size = . . . . . . . . . . . 1331200
--- WARNING ---
SRCDISK does not fit on CD (Needed > CD)
You can specify TYP=DVD instead of TYP=CD in bootcdwrite.conf.
You can exclude files/dirs in NOT_TO_CD in bootcdwrite.conf.
You can try to ignore this problem, if you only want an iso image.
--- (e)xit (i)gnore --- i
VAR =  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16467364
OK - enough space in /var/bootcd (Needed <= VAR)
NOT_TO_RAMCD (NOT_TO_RAM v NOT_TO_CD) =  . . . . . . . . . . . . . 136636
RAM_ALL (etc v home v root v NOT_TO_RAM v NOT_TO_CD) = . . . . . . 172112
Needed RAM (RAM_ALL - NOT_TO_RAMCD) =  . . . . . . . . . . . . . . 35476
90 % of RAM  = . . . . . . . . . . . . . . . . . . . . . . . . . . 77745
OK - enough RAM (Needed RAM <= 90 % of RAM)
--- Building Modifications ---
--- Creating /ram[1|2].cpio.gz for FASTBOOT ---
--- Creating CD-Image ---
--- Building input_dir for compression ---
--- Compressing input_dir to compressed_dir ---
Warning: using transparent compression. This is a nonstandard Rock Ridge
        extension. The resulting filesystem can only be transparently
        read on Linux. On other operating systems you need to call
        mkzftree by hand to decompress the files.

After giving this warning message the terminal hasbeen automatically
closed and final image is not created in the corresponding path. I
don't understand what is the actual error, and what is the solution of
it.
Please help me.
With regards
Animesh Das