AssetNotFound error for bass-music project

https://www.codecademy.com/courses/learn-rails/projects/learn-rails_bass-music

I am trying to do the bass-music project in rails Association I, but I am running into an AssetNotFound Error. The error message says: The asset "application.js" is not present in the asset pipeline.
I am still pretty new to rails and have no idea how to solve this problem or what it means. I have not run into it in any of the other projects.

Thanks.