Unable to access index for repository http://brainarray.mbni.med.umich.edu/bioc/bin/macosx/leopard/contrib/2.9

Hi,

I have the following R version installed.

R.app GUI 1.29 (5464 Leopard build 64-bit), S.Urbanek & S.M.Iacus, ? R
Foundation for Statistical Computing, 2009

But the following website is not accessible. Can somebody let me know
how to fix the problem?

Regards,
Peng

    biocLite("Biobase")

Using R version 2.9.2, biocinstall version 2.4.12.
Installing Bioconductor version 2.4 packages:
[1] "Biobase"
Please wait...

Warning: unable to access index for repository
http://brainarray.mbni.med.umich.edu/bioc/bin/macosx/leopard/contrib/2.9
trying URL 'http://bioconductor.org/packages/2.4/bioc/bin/macosx/leopard/contrib/2.9/Biobase_2.4.1.tgz'
Content type 'application/x-gzip' length 2420222 bytes (2.3 Mb)
opened URL
==================================================
downloaded 2.3 Mb


The downloaded packages are in
	/var/folders/Ta/TaHUCMjZFzax8V8w86S8W++++TM/-Tmp-//RtmptsUMOi/downloaded_packages