Tons of "invalid command \N" when restoring a dump

I'm following these instructions to upgrade postgres from 9.1 to 9.3: http://www.postgresql.org/docs/9.1/static/upgrading.html

When I restore (Step 8), I get a ton of messages like this: psql:/mnt/dumps/pre-upgrade.dump:61028: invalid command \N

Does anyone know the problem or can point me to a better upgrade instructions for Linux?