Update to Meteor Failing (TypeError: Path must be a string. Received undefined)

After updating to the new security fixes found in version Meteor my application now fails to load. When I run ‘meteor’ to bring up the app I get the following errors:

meteor --settings settings-dev.json
[[[[[ ~/Sites/app.s2h ]]]]]

=> Started proxy.
throw error;
TypeError: Path must be a string. Received undefined

When I revert back to previous version of meteor everything runs fine. Anyone else experiencing something similar?