Checksum Warning on apt-get update

Hi,

I've been out to the desert for a couple of weeks. Now when I'm back I'm 
having checksum errors when run sudo apt-get update, like the ones below.
Am I missing something or the packages just need to be re-generated?

W: Release file did not contain checksum information for 
http://kde-redhat.atrpms.net/apt/kde-redhat/3/base/pkglist.stable
W: Release file did not contain checksum information for 
http://kde-redhat.atrpms.net/apt/kde-redhat/3/base/release.stable
W: Release file did not contain checksum information for 
http://kde-redhat.atrpms.net/apt/kde-redhat/all/base/pkglist.stable
W: Release file did not contain checksum information for 
http://kde-redhat.atrpms.net/apt/kde-redhat/all/base/release.stable
W: Release file did not contain checksum information for 
http://kde-redhat.atrpms.net/apt/fedora/3/base/pkglist.stable
W: Release file did not contain checksum information for 
http://kde-redhat.atrpms.net/apt/fedora/3/base/release.stable
W: Release file did not contain checksum information for 
ftp://apt.kde-redhat.org/apt/kde-redhat/3/base/pkglist.stable
W: Release file did not contain checksum information for 
ftp://apt.kde-redhat.org/apt/kde-redhat/3/base/release.stable
W: Release file did not contain checksum information for 
ftp://apt.kde-redhat.org/apt/kde-redhat/all/base/pkglist.stable
W: Release file did not contain checksum information for 
ftp://apt.kde-redhat.org/apt/kde-redhat/all/base/release.stable
W: Release file did not contain checksum information for 
ftp://apt.kde-redhat.org/apt/fedora/3/base/pkglist.stable
W: Release file did not contain checksum information for 
ftp://apt.kde-redhat.org/apt/fedora/3/base/release.stable
W: Release file did not contain checksum information for 
ftp://apt.kde-redhat.org/apt/kde-redhat/3/base/srclist.stable
W: Release file did not contain checksum information for 
ftp://apt.kde-redhat.org/apt/kde-redhat/all/base/srclist.stable
W: You may want to run apt-get update to correct these problems

Thanks,
Vladimir