Looks like you're actually getting 2 errors.

1st error: W: Couldn't stat source package list http://non-us.debian.org ./ Packages (/var/lib/apt/lists/non-us.debian.org_%7ekitame_mozilla_._Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list http://people.debian.org sid/i386/ Packages (/var/lib/apt/lists/people.debian.org_%7ebranden_packages_sid_i386_Pac kages) - stat (2 No such file or directory)

Simply remove the offending sources from /etc/apt/sources.list

To fix this error E: Dynamic MMap ran out of room do:

Code:
# echo "APT::Cache-Limit 10000000;" > /etc/apt/apt.conf