aptitude upgrade error message

[Chuck Hallenbeck]

Can someone please explain this error? I have the following line in my
/etc/apt/sources.list:

deb-src http://ftp.us.debian.org/debian/ squeeze main

and when I do an aptitude full-upgrade, I get this error message:

E: Release file expired, ignoring
http://ftp.us.debian.org/debian/dists/squeeze/Release (invalid since 1d
20h 51min 30s)

I haven't made any changes in the sources.list  for many months, the
error just began occuring over the weekend.

Thanks,

Chuck

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