bundle exec rake assets:precompile
Try with:
//= require_tree .Instead of
//= require_treeWith the dot at the end. Like in the guides: http://guides.rubyonrails.org/asset_pipeline.html#manifest-files-and-directives
I saw this same error after updating gems on an older already-deployed app. I narrowed it down to uglifier, having been upgraded from 1.3.0 to 2.0.1. According to its README it needs a JS interpreter:
Ensure that your environment has a JavaScript interpreter supported by ExecJS. Installing therubyracer gem is a safe choice and having node in PATH works too.
But it's not a hard dependency, so it didn't get caught by bundler. Not wanting to pursue that quite yet, I switched uglifier back to 1.3.0 in the Gemfile:
gem 'uglifier', '1.3.0'and all was well.
check removing the below line form application.js
//= require_treerequire_tree loads all the files in app/javascripts dir recursively
If it works the there is some issue with one of the javascript file in app/assets/javascripts directory
check all the files in the directrory or
require the files one by one in application.js
//= require js_file_name