Openning error of a single page djvu extracted from another

Question

I extracted a single page djvu from page 197 of another djvu file 1.djvu by the command:

$ djvused 1.djvu -e 'select 197; save-page 197.djvu'

When I tried to open the djvu file with djview, I got this error:

Failed to open 0400.djbz: no such file or directory,
Cannot decode page 1
JB2 data requires a shape ditionary.
Cannot decode page 1.

I was wondering how to extract a single-page djvu file from another correctly? Thanks and regards!

PS: My OS is Ubuntu 10.10 if that helps.