I time to time get this message:
Loading semantic-c...done
File mode specification error: (error "Autoloading failed to define function semantic-default-c-setup")

$emacs --version
GNU Emacs 22.1.50.1
Copyright (C) 2007 Free Software Foundation, Inc.
GNU Emacs comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of Emacs
under the terms of the GNU General Public License.
For more information about these matters, see the file named COPYING.

$M-x cedet-version
CEDET Version: 1.0pre4
Requested File Loaded
Package Version Version Version
----------------------------------------------------------
cedet: 1.0pre4 ok ok
cogre: 0.5 ok Not Loaded
ede: 1.0pre4 ok ok
eieio: 1.0 ok ok
semantic: 2.0pre4 ok ok
speedbar: 1.0.1 ok ok
cedet-contrib: 1.0pre4 ok Not Loaded


I wonder what is this message mean, and how to fix this issue?