Checking MD5 sums...
If you are facing above error while restoring the backup using CMW then you can correct the error easily by using adb shell.
Connect your mobile to computer and start adb shell else you can use the similar commands on terminal emulator as well.
# cd /sdcard/clockworkmod/backup/2010-06-184.108.40.206
# rm nandroid.md5
# md5sum *img > nandroid.md5
First traverse to the backup directory for which you are facing the error. Delete the existing md5 sum file( nandroid.md5). Now generate the new md5 sum for all image files in the same directory. And you are done.
Now try to restore the backup.