[subversion] svn: Out of date: 'step1.py' in transaction 'k'

$ svn ci
Sending step1.py
Transmitting file data .svn: Commit failed (details follow):
svn: Out of date: 'step1.py' in transaction 'k'
svn: Your commit message was left in a temporary file:
svn: '/home/dhjang/script4/svn-commit.tmp'

$ svn --version
svn, version 1.0.9 (r11378)
compiled Oct 16 2004, 23:29:24

Copyright (C) 2000-2004 CollabNet.
Subversion is open source software, see http://subversion.tigris.org/
This product includes software developed by CollabNet (http://www.Collab.Net/).

The following repository access (RA) modules are available:

* ra_dav : Module for accessing a repository via WebDAV (DeltaV) protocol.
- handles 'http' schema
- handles 'https' schema
* ra_local : Module for accessing a repository on local disk.
- handles 'file' schema
* ra_svn : Module for accessing a repository using the svn network protocol.
- handles 'svn' schema