Ember Quickstart: Build Error when adding JS file to component

I just started using Ember. The next step in the Ember Quickstart tutorial is adding a JS file to a component:

In addition to the template, a component can also have a JavaScript file [...]. Go ahead and create a .js file with the same name and in the same directory as our template (app/components/people-list.js), and paste in the following content:

I did that, but now I get a build error:

Build Error (broccoli-persistent-filter:TemplateCompiler)

EEXIST: file already exists, symlink '/var/folders/9f/hkp3jgh507ld849g376t8v9c0000gp/T/broccoli-68910fD325sz6drb3/out-131-broccoli_merge_trees_templates/ember-quickstart/templates/components/people-list.js' -> '/var/folders/9f/hkp3jgh507ld849g376t8v9c0000gp/T/broccoli-68910fD325sz6drb3/out-132-broccoli_persistent_filter_template_compiler/ember-quickstart/templates/components/people-list.js'

How do I get rid of this?