TypeError: Cannot read property 'app' of undefined
at CoreObject.module.exports._findApp (/home/john/git/dev/cardstack-editor/node_modules/ember-concurrency/index.js:26:15)
at CoreObject.module.exports._includePolyfill (/home/john/git/dev/cardstack-editor/node_modules/ember-concurrency/index.js:20:24)
at CoreObject.module.exports.included (/home/john/git/dev/cardstack-editor/node_modules/ember-concurrency/index.js:10:10)
at CoreObject.included (/home/john/git/dev/cardstack-editor/node_modules/core-object/lib/assign-properties.js:32:18)
at /home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/models/addon.js:241:34
at Array.map (native)
at CoreObject.eachAddonInvoke (/home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/models/addon.js:239:24)
at CoreObject.extend.included (/home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/models/addon.js:367:10)
at CoreObject.included (/home/john/git/dev/cardstack-editor/node_modules/core-object/lib/assign-properties.js:32:18)
at EmberAddon.<anonymous> (/home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/broccoli/ember-app.js:435:15)
Cannot read property 'app' of undefined
TypeError: Cannot read property 'app' of undefined
at CoreObject.module.exports._findApp (/home/john/git/dev/cardstack-editor/node_modules/ember-concurrency/index.js:26:15)
at CoreObject.module.exports._includePolyfill (/home/john/git/dev/cardstack-editor/node_modules/ember-concurrency/index.js:20:24)
at CoreObject.module.exports.included (/home/john/git/dev/cardstack-editor/node_modules/ember-concurrency/index.js:10:10)
at CoreObject.included (/home/john/git/dev/cardstack-editor/node_modules/core-object/lib/assign-properties.js:32:18)
at /home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/models/addon.js:241:34
at Array.map (native)
at CoreObject.eachAddonInvoke (/home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/models/addon.js:239:24)
at CoreObject.extend.included (/home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/models/addon.js:367:10)
at CoreObject.included (/home/john/git/dev/cardstack-editor/node_modules/core-object/lib/assign-properties.js:32:18)
at EmberAddon.<anonymous> (/home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/broccoli/ember-app.js:435:15)
at Array.filter (native)
at EmberAddon.EmberApp._notifyAddonIncluded (/home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/broccoli/ember-app.js:430:45)
at EmberAddon.EmberApp [as appConstructor] (/home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/broccoli/ember-app.js:109:8)
at new EmberAddon (/home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/broccoli/ember-addon.js:38:8)
at module.exports (/home/john/git/dev/cardstack-editor/ember-cli-build.js:6:13)
at CoreObject.module.exports.Task.extend.setupBroccoliBuilder (/home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/models/builder.js:54:19)
at CoreObject.module.exports.Task.extend.init (/home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/models/builder.js:89:10)
at CoreObject.init (/home/john/git/dev/cardstack-editor/node_modules/core-object/lib/assign-properties.js:32:18)
at CoreObject.Class (/home/john/git/dev/cardstack-editor/node_modules/core-object/core-object.js:32:33)
at CoreObject.<anonymous> (/home/john/git/dev/cardstack-editor/node_modules/ember-cli/lib/commands/test.js:142:30)
at lib$rsvp$$internal$$tryCatch (/home/john/git/dev/cardstack-editor/node_modules/rsvp/dist/rsvp.js:1036:16)
at lib$rsvp$$internal$$invokeCallback (/home/john/git/dev/cardstack-editor/node_modules/rsvp/dist/rsvp.js:1048:17)
ember-cli: 2.6.0-beta.2
node: 0.12.15
os: linux x64
I had the same issue trying to build on an OS X machine too.
Please let me know if there is more information I can provide.