Can not update portage?

(chroot) livecd / # emerge portage
Calculating dependencies \!!! A file listed in the Manifest could not be found: /usr/portage/sys-apps/portage/portage-2.1.3.ebuild
 \!!! A file listed in the Manifest could not be found: /usr/portage/sys-apps/portage/portage-2.1.3.ebuild
... done!

>>> Emerging (1 of 1) sys-apps/portage-2.1.2.9 to /
!!! A file listed in the Manifest could not be found: /usr/portage/sys-apps/portage/portage-2.1.3.ebuild

(chroot) livecd / # emerge --info
Portage 2.1.2.2 (default-linux/x86/2007.0, gcc-4.1.1, glibc-2.5-r0, 2.6.19-gentoo-r5 i686)
=================================================================
System uname: 2.6.19-gentoo-r5 i686 AMD Athlon(tm) XP 1600+
Gentoo Base System release 1.12.9
Timestamp of tree: Sun, 12 Aug 2007 20:00:01 +0000
dev-lang/python: 2.4.3-r4
dev-python/pycrypto: 2.0.1-r5
sys-apps/sandbox: 1.2.17
sys-devel/autoconf: 2.61
sys-devel/automake: 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10
sys-devel/binutils: 2.16.1-r3
sys-devel/gcc-config: 1.3.14
sys-devel/libtool: 1.5.22
virtual/os-headers: 2.6.21
ACCEPT_KEYWORDS="x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2 -march=i686 -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/X11/xkb"
CONFIG_PROTECT_MASK="/etc/env.d /etc/gconf /etc/terminfo"
CXXFLAGS="-O2 -march=i686 -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="distlocks metadata-transfer sandbox sfperms strict"
GENTOO_MIRRORS="ftp://ftp3.tsinghua.edu.cn/mirror/gentoo"
LANG="zh_CN.GB18030"
LINGUAS="zh_CN"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --delete-after --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --filter=H_**/files/digest-*"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
SYNC="rsync://ftp3.tsinghua.edu.cn/gentoo/gentoo-portage"
USE="3dnow X Xaw3d accessibility acl alsa berkdb bitmap-fonts cjk cli cracklib crypt cups dbus dri fortran gdbm gif gpm gtk hal iconv ipv6 isdnlog jpeg jpeg2k libg++ midi mudflap ncurses nls nptl nptlonly opengl openmp pam pcre perl png pppd python readline reflection session spl ssl tcpd truetype-fonts type1-fonts unicode x86 xorg zlib" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1 emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mulaw multi null plug rate route share shm softvol" ELIBC="glibc" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="zh_CN" USERLAND="GNU" VIDEO_CARDS="apm ark chips cirrus cyrix dummy fbdev glint i128 i740 i810 imstt mach64 mga neomagic nsc nv r128 radeon rendition s3 s3virge savage siliconmotion sis sisusb tdfx tga trident tseng v4l vesa vga via vmware voodoo"
Unset: CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, LDFLAGS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, PORTDIR_OVERLAY