Strange cvsup problem

[=?gb2312?q?Da=20Shen?=]

Hi, all folks:

I use FreeBSD 4.7, and I have setup cvsup for updating
my src-all, ports-all and doc-all, it worked fine
before as I have used it for upgrading from 4.7
release to 4.7 stable. But after I changed supfile to
force it update to 4.9 release, the cvsup stoped
working and deleted all source under /usr/src. 

Here is the portion of non-comment of changed supfile:
*default host=cvsup4.uk.FreeBSD.org
*default base=/usr
*default prefix=/usr
*default release=cvs tag=RELENG_4_9
*default delete use-rel-suffix
*default compress
src-all
ports-all tag=.
doc-all tag=.

It seems that cvsup do get the updated files, but it
refuse to put them into the place. Here is the first
fragment of checkout file
/usr/sup/src-all/checkouts.cvs:RELENG_4_9:
F 5 1078885727
D src
c src/COPYRIGHT,v RELENG_4_9 .
2#871#110#10427097864#88033#444
c src/CVS-INFO,v RELENG_4_9 .
2#871#19#8562516724#55803#444
c src/HW.TROUBLE,v RELENG_4_9 .
2#871#19#8203481294#30043#444
c src/MAINTAINERS,v RELENG_4_9 .
2#871#110#10427097865#171633#444
c src/Makefile,v RELENG_4_9 .
2#871#110#10427097866#2558123#444
c src/Makefile.alpha,v RELENG_4_9 .
2#871#19#9033105495#346543#444
c src/Makefile.inc0,v RELENG_4_9 .
2#871#19#9615035415#143273#444
c src/Makefile.inc1,v RELENG_4_9 .
2#871#110#10427097866#2838243#444
c src/Makefile.upgrade,v RELENG_4_9 .
2#871#110#10427097865#285703#444
c src/README,v RELENG_4_9 .
2#871#110#10427097865#259503#444
c src/TODO,v RELENG_4_9 .
2#871#19#9365291215#122913#444
c src/UPDATING,v RELENG_4_9 .
2#871#110#10427900676#2555643#444
D src/bin
c src/bin/Makefile,v RELENG_4_9 .
2#871#110#10430853845#111233#444

Could anyone kindly help me sort out where goes wrong
and advise me how to fix this problem?

Thanks in advance!

Da  
 

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