Ember build failed - node.js

Question

I'm trying run an Ember project locally : https://github.com/cosmicjs/ember-real-estate-website?files=1. I'm using pycharm 2017 using git-bash as my terminal in win7. I have npm , node and ember installed . In pycharm my project looks like the screenshot.
After switching to the cosmic-real-estate folder:
$ ember build
Running without permission to symlink will degrade build performance.
See http://ember-cli.com/user-guide/#windows for details.
cleaning up...
Build failed.
The Broccoli Plugin: [Funnel: Funnel: index.html] failed with:
Error: EISDIR: illegal operation on a directory, symlink 'e:\ember-real-estate-website\cosmic-real-estate\app' -> 'e:\ember-real-estate-website\cosmic-real-estate\tmp\funnel-input_base_path-ZStiRJkX.tmp'
at Error (native)
at Object.fs.symlinkSync (fs.js:1069:18)
at symlinkWindows (e:\ember-real-estate-website\cosmic-real-estate\node_modules\symlink-or-copy\index.js:123:18)
at symlinkOrCopySync (e:\ember-real-estate-website\cosmic-real-estate\node_modules\symlink-or-copy\index.js:63:5)
at e:\ember-real-estate-website\cosmic-real-estate\node_modules\broccoli-plugin\read_compat.js:86:11
at tryCatch (e:\ember-real-estate-website\cosmic-real-estate\node_modules\rsvp\dist\rsvp.js:539:12)
at invokeCallback (e:\ember-real-estate-website\cosmic-real-estate\node_modules\rsvp\dist\rsvp.js:554:13)
at publish (e:\ember-real-estate-website\cosmic-real-estate\node_modules\rsvp\dist\rsvp.js:522:7)
at flush (e:\ember-real-estate-website\cosmic-real-estate\node_modules\rsvp\dist\rsvp.js:2414:5)
at _combinedTickCallback (internal/process/next_tick.js:73:7)
The broccoli plugin was instantiated at:
at Funnel.Plugin (e:\ember-real-estate-website\cosmic-real-estate\node_modules\broccoli-plugin\index.js:7:31)
at new Funnel (e:\ember-real-estate-website\cosmic-real-estate\node_modules\broccoli-funnel\index.js:58:10)
at EmberApp._rawAppIndex (e:\ember-real-estate-website\cosmic-real-estate\node_modules\ember-cli\lib\broccoli\ember-app.js:694:12)
at EmberApp.index (e:\ember-real-estate-website\cosmic-real-estate\node_modules\ember-cli\lib\broccoli\ember-app.js:678:20)
at EmberApp.toArray (e:\ember-real-estate-website\cosmic-real-estate\node_modules\ember-cli\lib\broccoli\ember-app.js:1661:12)
at EmberApp.toTree (e:\ember-real-estate-website\cosmic-real-estate\node_modules\ember-cli\lib\broccoli\ember-app.js:1684:38)
at module.exports (e:\ember-real-estate-website\cosmic-real-estate\ember-cli-build.js:26:14)
at Builder.setupBroccoliBuilder (e:\ember-real-estate-website\cosmic-real-estate\node_modules\ember-cli\lib\models\builder.js:56:19)
at new Builder (e:\ember-real-estate-website\cosmic-real-estate\node_modules\ember-cli\lib\models\builder.js:30:10)
at BuildTask.run (e:\ember-real-estate-website\cosmic-real-estate\node_modules\ember-cli\lib\tasks\build.js:15:19)
There is a new node_modules folder visible as well:
How can I get this working?