Strange Behaviour of apt-get update

[Paulo Henrique Baptista de Oliveira <baptista@cos.ufrj.br>]

	Hi all,
	today I'm trying to update my machines with apt and there is a strange
error:
Hit ftp://ftp.br.debian.org unstable/main Packages
Hit ftp://ftp.br.debian.org unstable/main Release
Hit ftp://ftp.br.debian.org unstable/contrib Packages
Hit ftp://ftp.br.debian.org unstable/contrib Release
Hit ftp://ftp.br.debian.org unstable/non-free Packages
Hit ftp://ftp.br.debian.org unstable/non-free Release
Reading Package Lists... Error!
E: Malformed Priority line
E: Error occured while processing aleph-dev (NewVersion1)
E: Problem with MergeList
/var/state/apt/lists/ftp.br.debian.org_debian_dists_unstable_main_binary-i386_Packages
E: The package lists or status file could not be parsed or opened.
update available list script returned error exit status 100.
Press RETURN to continue.

	What is this?
	Thanks,		Paulo Henrique