Sprockets::Rails::Helper::AssetNotPrecompiled Ruby / Rails Origin: Application & API OSI layer 7 · Application Last updated 5 Nov 2026

Rails: Asset `application.js` was not declared to be precompiled in production / The asset "application.css" is not present in the asset pipeline

A layout references an asset that Sprockets doesn't know to compile or can't find.

Exact message you may see Asset `application.js` was not declared to be precompiled in productionThe asset "application.css" is not present in the asset pipelineSprockets::Rails::Helper::AssetNotFound: The asset "x.png" is not present in the asset pipelineActionView::Template::Error (The asset "application.css" is not present in the asset pipeline)
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Seen on: Ruby

Meaning

Add the file to app/assets/config/manifest.js (//= link application.js), check the file name/extension, run bin/rails assets:precompile, and in production make sure public/assets exists (or assets are served by the web server). config.assets.compile = false in production requires precompiled assets.

Common causes

  • Asset not linked in manifest.js (Sprockets 4)
  • File missing or renamed
  • Assets not precompiled during deploy
  • javascript_include_tag for a pack built elsewhere
  • Digest/manifest cache stale

⚡ Quick fix

  1. Add //= link_tree ../images and //= link application.css to app/assets/config/manifest.js
  2. RAILS_ENV=production bin/rails assets:precompile
  3. Verify public/assets/.sprockets-manifest*.json

Detailed fix by platform

Rails

  1. bin/rails assets:clobber assets:precompile

How to diagnose

  1. manifest — Linked?
  2. Precompile — Run in deploy?
  3. File — Exists?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Application & API. Errors that are often confused with or caused by this one (click to open):

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