yarn install error

[pramodraja]

I downloaded code from master branch and when I run yarn install I am getting following error.

PS C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase> yarn install yarn install v1.12.3 [1/4] Resolving packages... [2/4] Fetching packages... info fsevents@1.1.2: The platform "win32" is incompatible with this module. info "fsevents@1.1.2" is an optional dependency and failed compatibility check. Excluding it from installation. [3/4] Linking dependencies... warning " > karma-webpack@2.0.3" has incorrect peer dependency "webpack@^1.1.0 || ^2 || ^2.1.0-beta.0 || ^2.2.0-rc.0". warning " > webpack-dev-server@2.5.0" has incorrect peer dependency "webpack@^2.2.0". [4/4] Building fresh packages... [-/2] ⠄ waiting... error C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\node-sass: Command failed. Exit code: 1 Command: node scripts/build.js Arguments: Directory: C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\node-sass Output: Building: C:\Program Files\nodejs\node.exe C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\node-gyp\bin\node-gyp.js rebuild --verbose --libsass_ext= --libsass_cflags= --libsass_ldflags= --libsass_library= gyp info it worked if it ends with ok gyp verb cli [ gyp verb cli 'C:\Program Files\nodejs\node.exe', gyp verb cli 'C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\node-gyp\bin\node-gyp.js', gyp verb cli 'rebuild', gyp verb cli '--verbose', gyp verb cli '--libsass_ext=', gyp verb cli '--libsass_cflags=', gyp verb cli '--libsass_ldflags=', gyp verb cli '--libsass_library=' gyp verb cli ] gyp info using node-gyp@3.6.2 gyp info using node@12.4.0 | win32 | x64 gyp verb command rebuild [] gyp verb command clean [] gyp verb clean removing "build" directory gyp verb command configure [] gyp verb check python checking for Python executable "python2" in the PATH gyp verb which failed Error: not found: python2 gyp verb which failed at getNotFoundError (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:13:12) gyp verb which failed at F (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:68:19) gyp verb which failed at E (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:80:29) gyp verb which failed at C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:89:16 gyp verb which failed at C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\isexe\index.js:42:5 gyp verb which failed at C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\isexe\windows.js:36:5 gyp verb which failed at FSReqCallback.oncomplete (fs.js:165:21) gyp verb which failed python2 Error: not found: python2 gyp verb which failed at getNotFoundError (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:13:12) gyp verb which failed at F (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:68:19) gyp verb which failed at E (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:80:29) gyp verb which failed at C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:89:16 gyp verb which failed at C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\isexe\index.js:42:5 gyp verb which failed at C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\isexe\windows.js:36:5 gyp verb which failed at FSReqCallback.oncomplete (fs.js:165:21) { gyp verb which failed stack: 'Error: not found: python2\n at getNotFoundError ' + gyp verb which failed '(C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:13:12)\n' + gyp verb which failed ' at F ' + gyp verb which failed '(C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:68:19)\n' + gyp verb which failed ' at E ' + gyp verb which failed '(C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:80:29)\n' + gyp verb which failed ' at ' + gyp verb which failed 'C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:89:16\n' + gyp verb which failed ' at ' + gyp verb which failed 'C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\isexe\index.js:42:5\n' + gyp verb which failed ' at ' + gyp verb which failed 'C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\isexe\windows.js:36:5\n' + gyp verb which failed ' at FSReqCallback.oncomplete (fs.js:165:21)', gyp verb which failed code: 'ENOENT' gyp verb which failed } gyp verb check python checking for Python executable "python" in the PATH gyp verb which failed Error: not found: python gyp verb which failed at getNotFoundError (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:13:12) gyp verb which failed at F (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:68:19) gyp verb which failed at E (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:80:29) gyp verb which failed at C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:89:16 gyp verb which failed at C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\isexe\index.js:42:5 gyp verb which failed at C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\isexe\windows.js:36:5 gyp verb which failed at FSReqCallback.oncomplete (fs.js:165:21) gyp verb which failed python Error: not found: python gyp verb which failed at getNotFoundError (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:13:12) gyp verb which failed at F (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:68:19) gyp verb which failed at E (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:80:29) gyp verb which failed at C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:89:16 gyp verb which failed at C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\isexe\index.js:42:5 gyp verb which failed at C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\isexe\windows.js:36:5 gyp verb which failed at FSReqCallback.oncomplete (fs.js:165:21) { gyp verb which failed stack: 'Error: not found: python\n at getNotFoundError ' + gyp verb which failed '(C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:13:12)\n' + gyp verb which failed ' at F ' + gyp verb which failed '(C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:68:19)\n' + gyp verb which failed ' at E ' + gyp verb which failed '(C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:80:29)\n' + gyp verb which failed ' at ' + gyp verb which failed 'C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\which\which.js:89:16\n' + gyp verb which failed ' at ' + gyp verb which failed 'C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\isexe\index.js:42:5\n' + gyp verb which failed ' at ' + gyp verb which failed 'C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\isexe\windows.js:36:5\n' + gyp verb which failed ' at FSReqCallback.oncomplete (fs.js:165:21)', gyp verb which failed code: 'ENOENT' gyp verb which failed } gyp verb could not find "python". checking python launcher gyp verb could not find "python". guessing location gyp verb ensuring that file exists: C:\Python27\python.exe gyp ERR! configure error gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable. gyp ERR! stack at PythonFinder.failNoPython (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\node-gyp\lib\configure.js:483:19) gyp ERR! stack at PythonFinder. (C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\node-gyp\lib\configure.js:508:16) gyp ERR! stack at C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\graceful-fs\polyfills.js:284:29 gyp ERR! stack at FSReqCallback.oncomplete (fs.js:165:21) gyp ERR! System Windows_NT 10.0.17763 gyp ERR! command "C:\Program Files\nodejs\node.exe" "C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\node-gyp\bin\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library=" gyp ERR! cwd C:\Pramod\Dev\ng\angular-pro-app-seed-01-firebase\node_modules\node-sass gyp ERR! node -v v12.4.0 gyp ERR! node-gyp -v v3.6.2 gyp ERR! not ok Build failed with error code: 1

[EnricoMassone]

@pramodraja did you managed to solve this ? I have similar problems on windows

[groninge01]

24 will fix this error. Otherwise you can just update the version in the package.json.

Edit: and install with 'npm' not 'yarn'.