error looking up layouts

[jasalguero]

Just trying to add it to a project doesn't work, installing with

ember install ember-collection

and then trying to use any of the default layouts gives me a:

ember.debug.js:15332 Uncaught Error: Assertion Failed: A helper named 'mixed-grid-layout' could not be found

Ember CLI version: 1.13.15
Ember version : 2.1.0

[cnatis]

@jasalguero I ran into the same issue after installing ember-collection while running ember serve. The solution was to restart ember serve.