Error apt-get!

[reloweb]

Hi,
I've installed a fresh Xbian 1.0 alpha 3 on my SD card but when I try to upgrade apt's sources, I got this error:

Quote:Reading package lists... Error!
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/aptmirror.no-ip.org_dists_wheezy_main_binary-armhf_Packages
E: The package lists or status file could not be parsed or opened.

...and I can't upgrade my system.
Can somebody help me?
Thanks!