apt-get: Reading Package Lists... Error!

[Joel Alexandre <jcma@rnl.ist.utl.pt>]

can someone please tell me why this is happening?


 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 courier-ssl (NewVersion1)
 E: Problem with MergeList

/var/lib/apt/lists/tux.cprm.net_debian_non-US_dists_stable_non-US_main_binary-i386_Packages
 E: The package lists or status file could not be parsed or opened.



thanks
Joel