Ember.cli acceptance tests Could not find module

I have been trying to figure out why my integration tests aren't working for a few days now. Here is the travis log:

http://ift.tt/1gdZ2Nq

The error is:

Could not find module ember-modal-dialog/initializers/add-modals-container imported from car-mileager-frontend/initializers/add-modals-container

The only reference to add-modals-container that I can find is in a third party package ember-cli-materialise.

I also mock my API using ember-mock.

Kind of new to ember so not sure what further debugging I can do. The source code for the project is:

http://ift.tt/1OuylPc

When I run

$ ember test

From my command line I get the same error...

Thanks for any help!