Unfortunately, the problem lies in a 3rd party utility. I think it might be broken. Try this and if it doesn't work, I'll post an update to avoid that 3rd party utility.
So, try going to /Users/mikelduffy/Library/Application Support/Alfred 2/Workflow Data/alfred.bundler-aries. Delete this alfred.bundler-aries directory. Then try to run the z:config again and tell me what happens. Hopefully alfred.bundler will reinstall itself and fix the problem. If it doesn't, I'll post a fix.
