I'm following the example shown on Peter Knolle's post here: https://developer.salesforce.com/blogs/developer-relations/2015/03/lightning-component-framework-custom-events.html

When creating the contactSearch Component, I'm getting the following error:

"Failed to save undefined: No CONTROLLER named apex://mynamespace.ContactSearchController found: Source"

I'm not sure what I've missing - any thoughts?