CVS_Upgrade from 5.3 to 5.4 problem

[Andrey Karyagin]

Hello.
Yesterday I try to full upgrade my server from 5.3-STABLE to 5.4-STABLE.
I made it with instructions from 
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html
Everything was ok, before "make installworld", that I make in SingleUser 
mode.
I get an error:

# make installworld
mkdir -p /tmp/install.XVdiLEJX
for prog in [ awk cap_mkdb cat chflags chmod chown  date echo egrep find 
grep  ln make mkdir mtree mv pwd_mkdb rm sed sh sysctl  test true uname 
wc zic; do  cp `which $prog` /tmp/install.XVdiLEJX;  done
cd /usr/src; MAKEOBJDIRPREFIX=/usr/obj  MACHINE_ARCH=i386  MACHINE=i386  
CPUTYPE=  GROFF_BIN_PATH=/usr/obj/usr/src/i386/legacy/usr/bin  
GROFF_FONT_PATH=/usr/obj/usr/src/i386/legacy/usr/share/groff_font  
GROFF_TMAC_PATH=/usr/obj/usr/src/i386/legacy/usr/share/tmac  
PATH=/usr/obj/usr/src/i386/legacy/usr/sbin:/usr/obj/usr/src/i386/legacy/usr/bin:/usr/obj/usr/src/i386/legacy/usr/games:/usr/obj/usr/src/i386/usr/sbin:/usr/obj/usr/src/i386/usr/bin:/usr/obj/usr/src/i386/usr/games:/tmp/install.XVdiLEJX 
make -f Makefile.inc1 reinstall
make: Permission denied
*** Error code 126

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.

What does it mean? May be somebody have such problems?
Thank you for your help!