FW: completion TAB missing

H i 
> I have a problem of missing TAB completion  in xemacs-21.1.14. I Record
> this error trace and this is what I gat 
> pls try to help me with this bug.
> 
> start of error file:
> 
> This bug report will be sent to the XEmacs Development Team,
>  not to your local site managers!!
> Please write in English, because the XEmacs maintainers do not have
> translators to read other languages for them.
> 
> In XEmacs 21.1 (patch 14) "Cuyahoga Valley" [Lucid] (i386-redhat-linux,
> Mule) of Mon Feb  5 2001 on osb1.acl.lanl.gov
> configured using `configure i386-redhat-linux --prefix=/usr
> --exec-prefix=/usr --bindir=/usr/bin --datadir=/usr/share
> --libdir=/usr/lib --mandir=/usr/man/man1 --infodir=/usr/info --with-gpm=no
> --with-sound=native --with-pop --mail-locking=lockf --with-clash-detection
> --debug=no --error-checking=none --lockdir=/var/lock/xemacs
> --with-mule=yes --with-ldap=yes --with-hesiod=no --with-menubars=lucid
> --with-scrollbars=lucid --with-dialogs=athena3d --with-xim=xlib
> --with-msw=no'
> 
> Please describe exactly what actions triggered the bug
> and the precise symptoms of the bug:
> 
> I open *.cpp file type the word #inclu type <TAB> & nothing is happend?
> 
> 
> Recent keystrokes:
> 
> C-x f C-x C-f SPC M TAB T TAB e TAB m a i TAB RET down 
> down down down down down down down down down down down 
> down down down down down down up # i n c l u TAB M-x 
> r e o p r t TAB SPC BS BS TAB BS BS TAB p TAB o TAB 
> r TAB RET
> 
> 
> Recent messages (most recent first):
> 
> Loading mail-abbrevs...
> Loading emacsbug...done
> Loading emacsbug...
> Making completion list...
> Making completion list...
> Making completion list...
> Loading cc-mode...done
> Loading cc-mode...
> Loading efs-cu...done
> Loading efs-cu..