Error: Asset 'application.css' was not declared to be precompiled in production

[john-999]

I'm getting the error:

ActionView::Template::Error (Asset 'application.css' was not declared to be precompiled in production.
Declare links to your assets in 'app/assets/config/manifest.js'.

  //= link application.css
and restart your server):

But I have my application.scss (NOT .css) in app/assets/stylesheets and my app/assets/config/manifest.js says:

//= link_tree ../images
//= link_directory ../javascripts .js
//= link_directory ../stylesheets .scss

I'm using:

• sprockets 4.0.0
• sprockets-rails 3.2.1
• rails 6.0.2.1

Temporary solution: Downgrade the gem as follows:

gem 'sprockets-rails', '2.3.3'

[johnnorris]

I've also just had this same problem with the same versions, and the same temporary solution worked for me.

[dimameshcharakou]

rake tmp:clear helped me.

[MichaelSeeberger]

Doing what the error told me worked. My app/assets/config/manifest.js now looks like this:

//= link_tree ../images
//= link application.css

I too have application.scss and not application.css. I have the same versions, except rails is 6.0.2.2

[thebravoman]

Same problem, but with application.scss.erb.

Workaroud it with

gem 'sprockets-rails', '2.3.3'

[roxannecojocariu]

Same problem for me. Sprockets updated it's documentation to explain why this is happening and how to fix it. Essentially, you'll need to add subdirectories in your app/assets/stylesheets. This solution is the only one that's worked for me so far.

[danielricecodes]

rake tmp:clear

Worked. This should be added to the original post as the solution since so many people have 👍'd it.

The recommendation to downgrade sprockets-rails should be avoided. A local problem that can be easily solved by flushing your Rails.root/tmp directory should not require making a commit and then unduly influencing every other environment, dev machine, CI system, etc.

[Flip437]

rake tmp:clear didn't work for me
downgrading to gem 'sprockets-rails', '2.3.3' with bundle install worked for me

[magedeungaro]

rake tmp:clear helped me.

This helped me, thanks