Error when running apt-get update

[sunpascal]

What excactly does this mean after running apt-get update:

Reading Package Lists... Error!
E: Dynamic MMap ran out of room
E: Dynamic MMap ran out of room
E: Error occured while processing figlet (NewVersion1)
E: Problem with MergeList /var/lib/apt/lists/ftp.de.debian.org_debian_dists_unstable_non-free_binary-i386_Packages
E: The package lists or status file could not be parsed or opened.

I hav no idea. Is it my sources.list file?

Pascal

[Markus]

Your apt-cache ran out of room. Make sure you have given apt enough to play with:
markus@fujibox:~$ grep Limit /etc/apt/apt.conf
APT::Cache-Limit 10000000;

Also have a look at your hd space with: df -h

Oh, and if you've never emptied the cache you can do: apt-get clean