port install failed

[Shiyuan]

Hello,
     I get an error when I try to do
     sudo port install emacs
 the error is :
Error: Unable to execute port: couldn't open
"/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_editors_emacs/emacs/work/.macports.emacs.state":
permission denied

I check the permission which is : -rw-r--r--  root.
But I notice the file size is 0.

What could go wrong? Thanks.
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