Hello 
My first post, been reading a lot of topic here from month.
I’m really new to all this stuff (1 year xp junior front end dev), so be nice with me 
First thanks a lot, you guys saved my life and enormous debugging time(I especially thanks the guy with avatar of a big beard and square glasses, sorry I don’t remember your name but 1000 thanks to you).
But today, I can’t find answer to my problem, so there it is :
When I npm run start, I got a blank page who’s loading infinitely.
When I inspect this page, I got only the <head> (who is correct: good links, scripts, titles, meta etc…) but no <body>.
When I change something in a files nothing happens.
What I got in my terminal:
Summary
webpack is watching the files…
(node:40683) DeprecationWarning: Tapable.plugin is deprecated. Use new API on `.hooks` instead
DONE Compiled successfully in 923ms
ConcurrentCompilationError: You ran Webpack twice. Each instance only supports a single concurrent compilation at a time.
at Compiler.watch (/Users/user009/project/portail-project/web/app/themes/project/node_modules/webpack/lib/Compiler.js:237:36)
at Object.startWatch (/Users/user009/project/portail-project/web/app/themes/project/node_modules/browsersync-webpack-plugin/node_modules/webpack-dev-middleware/lib/Shared.js:176:29)
at Shared (/Users/user009/project/portail-project/web/app/themes/project/node_modules/browsersync-webpack-plugin/node_modules/webpack-dev-middleware/lib/Shared.js:238:8)
at module.exports (/Users/user009/project/portail-project/web/app/themes/project/node_modules/browsersync-webpack-plugin/node_modules/webpack-dev-middleware/middleware.js:22:15)
at BrowserSyncWebpackPlugin.setupWebpackDevMiddleware (/Users/user009/project/portail-project/web/app/themes/project/node_modules/browsersync-webpack-plugin/index.js:162:34)
at BrowserSyncWebpackPlugin.setup (/Users/user009/project/portail-project/web/app/themes/project/node_modules/browsersync-webpack-plugin/index.js:151:12)
at BrowserSyncWebpackPlugin.start (/Users/user009/project/portail-project/web/app/themes/project/node_modules/browsersync-webpack-plugin/index.js:130:11)
at Object.onceWrapper (events.js:288:20)
at BrowserSyncWebpackPlugin.emit (events.js:200:13)
at AsyncSeriesHook.eval (eval at create (/Users/user009/project/portail-project/web/app/themes/project/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:18:1)
at AsyncSeriesHook.lazyCompileHook [as callAsync] (/Users/user009/project/portail-project/web/app/themes/project/node_modules/tapable/lib/Hook.js:154:20)
at Watching._done (/Users/user009/project/portail-project/web/app/themes/project/node_modules/webpack/lib/Watching.js:98:28)
at /Users/user009/project/portail-project/web/app/themes/project/node_modules/webpack/lib/Watching.js:73:19
at Compiler.emitRecords (/Users/user009/project/portail-project/web/app/themes/project/node_modules/webpack/lib/Compiler.js:499:39)
at /Users/user009/project/portail-project/web/app/themes/project/node_modules/webpack/lib/Watching.js:54:20
at /Users/user009/project/portail-project/web/app/themes/project/node_modules/webpack/lib/Compiler.js:485:14
at eval (eval at create (/Users/user009/project/portail-project/web/app/themes/project/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:21:1)
at callback (/Users/user009/project/portail-project/web/app/themes/project/node_modules/stylelint-webpack-plugin/lib/run-compilation.js:57:5)
at _next0 (eval at create (/Users/user009/project/portail-project/web/app/themes/project/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:17:1)
at eval (eval at create (/Users/user009/project/portail-project/web/app/themes/project/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:31:1)
at module.exports.afterEmitHandler (/Users/user009/project/portail-project/web/app/themes/project/node_modules/copy-globs-webpack-plugin/index.js:209:9)
at AsyncSeriesHook.eval [as callAsync] (eval at create (/Users/user009/project/portail-project/web/app/themes/project/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:27:1)
at AsyncSeriesHook.lazyCompileHook (/Users/user009/project/portail-project/web/app/themes/project/node_modules/tapable/lib/Hook.js:154:20)
at /Users/user009/project/portail-project/web/app/themes/project/node_modules/webpack/lib/Compiler.js:482:27
at /Users/user009/project/portail-project/web/app/themes/project/node_modules/neo-async/async.js:2818:7
at done (/Users/user009/project/portail-project/web/app/themes/project/node_modules/neo-async/async.js:3522:9)
at AsyncSeriesHook.eval [as callAsync] (eval at create (/Users/user009/project/portail-project/web/app/themes/project/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:6:1)
at /Users/user009/project/portail-project/web/app/themes/project/node_modules/webpack/lib/Compiler.js:464:33
at /Users/user009/project/portail-project/web/app/themes/project/node_modules/graceful-fs/graceful-fs.js:61:14
at FSReqCallback.oncomplete (fs.js:153:23)
[HTML Injector] Running...
[Browsersync] Proxying: http://project.test
[Browsersync] Access URLs:
-------------------------------------
Local: http://localhost:3000
External: http://192.168.0.10:3000
-------------------------------------
UI: http://localhost:3001
UI External: http://localhost:3001
-------------------------------------
[Browsersync] Watching files...
I’m on it since monday, do a lot of research about that, and I have no clue what’s happening here.
My package.json :
Summary
{
"name": "sage",
"version": "9.0.9",
"author": "Roots <team@roots.io>",
"homepage": "https://roots.io/sage/",
"private": true,
"repository": {
"type": "git",
"url": "git://github.com/roots/sage.git"
},
"bugs": {
"url": "https://github.com/roots/sage/issues"
},
"licenses": [
{
"type": "MIT",
"url": "http://opensource.org/licenses/MIT"
}
],
"browserslist": [
"last 2 versions",
"android 4",
"opera 12"
],
"scripts": {
"build": "webpack --progress --config resources/assets/build/webpack.config.js",
"build:production": "webpack --env.production --progress --config resources/assets/build/webpack.config.js",
"build:profile": "webpack --progress --profile --json --config resources/assets/build/webpack.config.js",
"start": "webpack --mode=development --hide-modules --watch --config resources/assets/build/webpack.config.js",
"rmdist": "rimraf dist",
"lint": "npm run -s lint:scripts && npm run -s lint:styles",
"lint:scripts": "eslint resources/assets/scripts resources/assets/build",
"lint:styles": "stylelint \"resources/assets/styles/**/*.{css,sass,scss,sss,less}\"",
"test": "npm run -s lint",
"test:jest": "jest"
},
"engines": {
"node": ">= 8.0.0"
},
"devDependencies": {
"autoprefixer": "~8.2.0",
"browser-sync": "^2.26.7",
"browsersync-webpack-plugin": "^0.6.0",
"bs-html-injector": "~3.0",
"buble-loader": "^0.4.1",
"cache-loader": "~1.2.5",
"clean-webpack-plugin": "^0.1.18",
"copy-globs-webpack-plugin": "^0.3.0",
"css-loader": "^0.28.9",
"cssnano": "~4.0.5",
"eslint": "~4.19.1",
"eslint-loader": "~1.9",
"eslint-plugin-import": "~2.14.0",
"extract-text-webpack-plugin": "^4.0.0-beta.0",
"file-loader": "^1.1.6",
"friendly-errors-webpack-plugin": "^1.6.1",
"imagemin-mozjpeg": "~7.0.0",
"imagemin-webpack-plugin": "^2.4.2",
"import-glob": "~1.5",
"postcss-loader": "~2.1.0",
"postcss-safe-parser": "~3.0",
"resolve-url-loader": "^2.3.2",
"rimraf": "~2.6",
"sass-loader": "~6.0",
"style-loader": "^0.22.1",
"stylelint": "^8.4.0",
"stylelint-config-standard": "~18.2.0",
"stylelint-webpack-plugin": "^0.10.5",
"uglifyjs-webpack-plugin": "^1.3.0",
"url-loader": "^0.6.2",
"webpack": "^4.43.0",
"webpack-assets-manifest": "^1.0.0",
"webpack-cli": "^3.3.12",
"webpack-dev-middleware": "~2.0.4",
"webpack-hot-middleware": "~2.22.3",
"webpack-merge": "~4.1.4",
"yargs": "~11.0.0"
},
"dependencies": {
"animate.css": "^4.1.1",
"bootstrap": "v4.3.1",
"jquery": "^3.5.1",
"lottie-web": "^5.7.3",
"node-sass": "^4.14.1",
"popper.js": "^1.16.1",
"slick-carousel": "^1.8.1",
"yarn": "^1.22.4"
}
}
Webpack config files, config.json(with the good devUrl) and composer.json are the same as what you can found in GitHub - roots/sage at 9.0.9
Node version is v12.4.0
My problem is the same on 4 differents computers (one windows and 3 differents macs)
Thanks for your helps, excuse my poor english 