this db schema change should be here. clearly you've run a migration that's not on master. the latest migration in master is 20130318033458 but this schema says you've run migration 20130326013603 (which doesn't exist on master). so you should try to find that migration and roll it back. or create an empty migration with that timestamp and migrate it down and then delete it. or just delete that entry in the migrations table in your loomio database. then it won't keep trying to commit this schema change. =)