"build.command" failed without error log

Support
,
1

Hi all,

I’m attempting to deploy my react app but I am getting Failed during stage 'building site': Build script returned non-zero exit code: 2 when I do so. The problem is that it doesn’t seems to log what the failure is (only warnings)

1:39:54 PM: build-image version: d7b3813f01c06610bc1723ff1b22446513ee7941 (focal)
1:39:54 PM: build-image tag: v4.14.3
1:39:54 PM: buildbot version: 4dcf475b8df8e5368becf6538fc83d1d4914f8fc
1:39:54 PM: Fetching cached dependencies
1:39:54 PM: Starting to download cache of 104.0MB
1:39:55 PM: Finished downloading cache in 1.115464309s
1:39:55 PM: Starting to extract cache
1:39:56 PM: Finished extracting cache in 1.102057223s
1:39:56 PM: Finished fetching cache in 2.263175767s
1:39:56 PM: Starting to prepare the repo for build
1:39:57 PM: Preparing Git Reference pull/1/head
1:39:57 PM: Parsing package.json dependencies
1:39:58 PM: Starting build script
1:39:58 PM: Installing dependencies
1:39:58 PM: Python version set to 2.7
1:39:59 PM: Started restoring cached node version
1:39:59 PM: Finished restoring cached node version
1:39:59 PM: v16.18.0 is already installed.
1:40:00 PM: Now using node v16.18.0 (npm v8.19.2)
1:40:00 PM: Enabling node corepack
1:40:00 PM: Started restoring cached build plugins
1:40:00 PM: Finished restoring cached build plugins
1:40:00 PM: Attempting ruby version 2.7.2, read from environment
1:40:00 PM: Using ruby version 2.7.2
1:40:01 PM: Using PHP version 8.0
1:40:01 PM: No npm workspaces detected
1:40:01 PM: Started restoring cached node modules
1:40:01 PM: Finished restoring cached node modules
1:40:01 PM: Installing NPM modules using NPM version 8.19.2
1:40:05 PM: added 140 packages, removed 214 packages, changed 32 packages, and audited 1369 packages in 4s
1:40:05 PM: 213 packages are looking for funding
1:40:05 PM:   run `npm fund` for details
1:40:05 PM: 6 high severity vulnerabilities
1:40:05 PM: To address all issues (including breaking changes), run:
1:40:05 PM:   npm audit fix --force
1:40:05 PM: Run `npm audit` for details.
1:40:05 PM: NPM modules installed
1:40:05 PM: Creating package sha
1:40:05 PM: Started restoring cached go cache
1:40:05 PM: Finished restoring cached go cache
1:40:05 PM: Installing Go version 1.17 (requested 1.17)
1:40:09 PM: unset GOOS;
1:40:09 PM: unset GOARCH;
1:40:09 PM: export GOROOT='/opt/buildhome/.gimme/versions/go1.17.linux.amd64';
1:40:09 PM: export PATH="/opt/buildhome/.gimme/versions/go1.17.linux.amd64/bin:${PATH}";
1:40:09 PM: go version >&2;
1:40:09 PM: export GIMME_ENV="/opt/buildhome/.gimme/env/go1.17.linux.amd64.env"
1:40:09 PM: go version go1.17 linux/amd64
1:40:10 PM: Detected 1 framework(s)
1:40:10 PM: "create-react-app" at version "5.0.1"
1:40:10 PM: Installing missing commands
1:40:10 PM: Verify run directory
1:40:11 PM: ​
1:40:11 PM: ────────────────────────────────────────────────────────────────
1:40:11 PM:   Netlify Build                                                 
1:40:11 PM: ────────────────────────────────────────────────────────────────
1:40:11 PM: ​
1:40:11 PM: ❯ Version
1:40:11 PM:   @netlify/build 28.1.7
1:40:11 PM: ​
1:40:11 PM: ❯ Flags
1:40:11 PM:   baseRelDir: true
1:40:11 PM:   buildId: 63650818c527200008cf7a1c
1:40:11 PM:   deployId: 63650818c527200008cf7a1e
1:40:11 PM: ​
1:40:11 PM: ❯ Current directory
1:40:11 PM:   /opt/build/repo
1:40:11 PM: ​
1:40:11 PM: ❯ Config file
1:40:11 PM:   No config file was defined: using default values.
1:40:11 PM: ​
1:40:11 PM: ❯ Context
1:40:11 PM:   deploy-preview
1:40:11 PM: ​
1:40:11 PM: ────────────────────────────────────────────────────────────────
1:40:11 PM:   1. Build command from Netlify app                             
1:40:11 PM: ────────────────────────────────────────────────────────────────
1:40:11 PM: ​
1:40:11 PM: $ npm run build
1:40:11 PM: > storybook-import-app@0.1.0 build
1:40:11 PM: > react-scripts build
1:40:12 PM: Creating an optimized production build...
1:40:32 PM: 
1:40:32 PM: Treating warnings as errors because process.env.CI = true.
1:40:32 PM: Most CI servers set it automatically.
1:40:32 PM: 
1:40:32 PM: Failed to compile.
1:40:32 PM: 
1:40:32 PM: Warning
1:40:32 PM: (1024:3) autoprefixer: start value has mixed support, consider using flex-start instead
1:40:32 PM: Warning
1:40:32 PM: (14:3) autoprefixer: start value has mixed support, consider using flex-start instead
1:40:32 PM: Warning
1:40:32 PM: (15:3) autoprefixer: start value has mixed support, consider using flex-start instead
1:40:32 PM: Warning
1:40:32 PM: (42:3) autoprefixer: start value has mixed support, consider using flex-start instead
1:40:33 PM: Creating deploy upload records
1:40:32 PM: Warning
1:40:32 PM: (43:3) autoprefixer: start value has mixed support, consider using flex-start instead
1:40:32 PM: ​
1:40:32 PM: ────────────────────────────────────────────────────────────────
1:40:33 PM: Failed during stage 'building site': Build script returned non-zero exit code: 2 (https://ntl.fyi/exit-code-2)
1:40:32 PM:   "build.command" failed                                        
1:40:32 PM: ────────────────────────────────────────────────────────────────
1:40:32 PM: ​
1:40:32 PM:   Error message
1:40:32 PM:   Command failed with exit code 1: npm run build (https://ntl.fyi/exit-code-1)
1:40:32 PM: ​
1:40:32 PM:   Error location
1:40:32 PM:   In Build command from Netlify app:
1:40:32 PM:   npm run build
1:40:32 PM: ​
1:40:32 PM:   Resolved config
1:40:32 PM:   build:
1:40:32 PM:     command: npm run build
1:40:32 PM:     commandOrigin: ui
1:40:32 PM:     environment:
1:40:32 PM:       - NPM_TOKEN
1:40:32 PM:       - REVIEW_ID
1:40:32 PM:     publish: /opt/build/repo/build
1:40:32 PM:     publishOrigin: ui
1:40:33 PM: Caching artifacts
1:40:33 PM: Started saving node modules
1:40:33 PM: Finished saving node modules
1:40:33 PM: Started saving build plugins
1:40:33 PM: Finished saving build plugins
1:40:33 PM: Started saving pip cache
1:40:33 PM: Finished saving pip cache
1:40:33 PM: Started saving emacs cask dependencies
1:40:33 PM: Finished saving emacs cask dependencies
1:40:33 PM: Started saving maven dependencies
1:40:33 PM: Finished saving maven dependencies
1:40:33 PM: Started saving boot dependencies
1:40:33 PM: Finished saving boot dependencies
1:40:33 PM: Started saving rust rustup cache
1:40:33 PM: Finished saving rust rustup cache
1:40:33 PM: Started saving go dependencies
1:40:33 PM: Finished saving go dependencies
1:40:33 PM: Build failed due to a user error: Build script returned non-zero exit code: 2
1:40:33 PM: Failing build: Failed to build site
1:40:33 PM: Finished processing build request in 39.123196278s

Please let me know how I can identify the cause of the failing build

2

Hey there! It looks like the error is indicating that you will need to adjust the build command that you have. Have you tried different build commands?

I also encourage you to search the forums for related threads: Search results for 'exit code 2' - Netlify Support Forums

3

Hi Hilary,

it appears that fixing the issue causing this warning; (1024:3) autoprefixer: start value has mixed support, consider using flex-start instead fixed the build.

I believe that this was incorrectly shown as a warning due to Treating warnings as errors because process.env.CI = true. (P.S. For anyone reading this can be turned off by changing the build command to CI=false npm run build)

Thanks :slight_smile:

4

Thanks so much for coming back and letting us know! Sharing this solution will help future Forums members who encounter similar situations.

Happy building :rocket: