EmberJS Build Failed with no such file or directory for jquery.js

I have an Ember + Django project that previously worked last week and I have not made a single change since. But now every time I rebuild the project it gives me the following error:

Build failed.
The Broccoli Plugin: [SourceMapConcat: Concat: Vendor /assets/vendor.js] failed with:
Error: ENOENT: no such file or directory, stat '/Users/IFH/Desktop/planner/planner-frontend/frontend/tmp/source_map_concat-input_base_path-http://ift.tt/2pcYVd7'
    at Error (native)
    at Object.fs.statSync (fs.js:844:18)
    at Concat.keyForFile (/Users/IFH/Desktop/planner/planner-frontend/frontend/node_modules/broccoli-caching-writer/index.js:87:20)
    at Array.map (native)
    at Concat.CachingWriter._conditionalBuild (/Users/IFH/Desktop/planner/planner-frontend/frontend/node_modules/broccoli-caching-writer/index.js:109:65)
    at /Users/IFH/Desktop/planner/planner-frontend/frontend/node_modules/broccoli-caching-writer/node_modules/broccoli-plugin/read_compat.js:61:34
    at tryCatch (/Users/IFH/Desktop/planner/planner-frontend/frontend/node_modules/rsvp/dist/rsvp.js:539:12)
    at invokeCallback (/Users/IFH/Desktop/planner/planner-frontend/frontend/node_modules/rsvp/dist/rsvp.js:554:13)
    at publish (/Users/IFH/Desktop/planner/planner-frontend/frontend/node_modules/rsvp/dist/rsvp.js:522:7)
    at flush (/Users/IFH/Desktop/planner/planner-frontend/frontend/node_modules/rsvp/dist/rsvp.js:2414:5)

Previously it would create those files in that 'tmp' directory, but now nothing is even being created. Once again, I did not change any file before this error occurred. Please let me know what I should change in order to fix this issue.