Broccoli error when trying to do ember tutorial

I am at the last step of this part of the ember.js tutorial. http://ift.tt/2vxaLzq

I receive this error when attempting to run the ember server after adding the ember-cli-mirage addon.

steven@steven-VirtualBox:~/em-test$ ember s
Could not start watchman
Visit http://ift.tt/2huy34z for more info.
Livereload server on http://localhost:49153
'instrument' is imported from external module 'ember-data/-debug' but never used
The Broccoli Plugin: [BroccoliMergeTrees: Addon#treeFor (ember-cli-mirage - addon)] failed with:
SyntaxError: Unexpected end of input
    at Object.parse (native)
    at /home/steven/em-test/node_modules/broccoli-persistent-filter/lib/strategies/persistent.js:35:23
    at tryCatch (/home/steven/em-test/node_modules/rsvp/dist/rsvp.js:525:12)
    at invokeCallback (/home/steven/em-test/node_modules/rsvp/dist/rsvp.js:538:13)
    at /home/steven/em-test/node_modules/rsvp/dist/rsvp.js:606:14
    at flush (/home/steven/em-test/node_modules/rsvp/dist/rsvp.js:2415:5)
    at nextTickCallbackWith0Args (node.js:436:9)
    at process._tickCallback (node.js:365:13)

Any help parsing this stack? Not sure what any of this is doing at the moment, just trying to get through the tutorial.