Npm install -- Throws be python error

[ShunmugamAiyappan]

E:\Projects\FrontEnd\Incentivio\isomorphic500\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 [ 'C:\Users\Shan-Aeturnum\AppData\Roaming\nvm\v6.11.2\node.exe',
gyp verb cli 'E:\Projects\FrontEnd\Incentivio\isomorphic500\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 info using [email protected]
gyp info using [email protected] | 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 (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:13:12)
gyp verb which failed at F (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:68:19)
gyp verb which failed at E (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:80:29)
gyp verb which failed at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:89:16
gyp verb which failed at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\isexe\index.js:42:5
gyp verb which failed at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\isexe\windows.js:36:5
gyp verb which failed at FSReqWrap.oncomplete (fs.js:123:15)
gyp verb which failed python2 { Error: not found: python2
gyp verb which failed at getNotFoundError (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:13:12)
gyp verb which failed at F (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:68:19)
gyp verb which failed at E (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:80:29)
gyp verb which failed at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:89:16
gyp verb which failed at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\isexe\index.js:42:5
gyp verb which failed at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\isexe\windows.js:36:5
gyp verb which failed at FSReqWrap.oncomplete (fs.js:123:15)
gyp verb which failed stack: 'Error: not found: python2\n at getNotFoundError (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:13:12)\n at F (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:68:19)\n at E (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:80:29)\n at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:89:16\n at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\isexe\index.js:42:5\n at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\isexe\windows.js:36:5\n at FSReqWrap.oncomplete (fs.js:123:15)',
gyp verb which failed code: 'ENOENT' }
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 (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:13:12)
gyp verb which failed at F (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:68:19)
gyp verb which failed at E (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:80:29)
gyp verb which failed at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:89:16
gyp verb which failed at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\isexe\index.js:42:5
gyp verb which failed at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\isexe\windows.js:36:5
gyp verb which failed at FSReqWrap.oncomplete (fs.js:123:15)
gyp verb which failed python { Error: not found: python
gyp verb which failed at getNotFoundError (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:13:12)
gyp verb which failed at F (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:68:19)
gyp verb which failed at E (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:80:29)
gyp verb which failed at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:89:16
gyp verb which failed at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\isexe\index.js:42:5
gyp verb which failed at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\isexe\windows.js:36:5
gyp verb which failed at FSReqWrap.oncomplete (fs.js:123:15)
gyp verb which failed stack: 'Error: not found: python\n at getNotFoundError (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:13:12)\n at F (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:68:19)\n at E (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:80:29)\n at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\which\which.js:89:16\n at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\isexe\index.js:42:5\n at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\isexe\windows.js:36:5\n at FSReqWrap.oncomplete (fs.js:123:15)',
gyp verb which failed code: 'ENOENT' }
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 Object.failNoPython (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\node-gyp\lib\configure.js:483:19)
gyp ERR! stack at Object. (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\node-gyp\lib\configure.js:508:16)
gyp ERR! stack at E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\graceful-fs\polyfills.js:284:29
gyp ERR! stack at FSReqWrap.oncomplete (fs.js:123:15)
gyp ERR! System Windows_NT 10.0.14393
gyp ERR! command "C:\Users\Shan-Aeturnum\AppData\Roaming\nvm\v6.11.2\node.exe" "E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\node-gyp\bin\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\node-sass
gyp ERR! node -v v6.11.2
gyp ERR! node-gyp -v v3.6.2
gyp ERR! not ok
Build failed
npm WARN Error: EPERM: operation not permitted, scandir 'E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\fsevents\node_modules\dashdash\node_modules'
npm WARN at Error (native)
npm WARN { Error: EPERM: operation not permitted, scandir 'E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\fsevents\node_modules\dashdash\node_modules'
npm WARN at Error (native)
npm WARN stack: 'Error: EPERM: operation not permitted, scandir 'E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\fsevents\node_modules\dashdash\node_modules'\n at Error (native)',
npm WARN errno: -4048,
npm WARN code: 'EPERM',
npm WARN syscall: 'scandir',
npm WARN path: 'E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\fsevents\node_modules\dashdash\node_modules' }
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] postinstall: node scripts/build.js
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

[ShunmugamAiyappan]

I have change the node-sass version, now its working

[ShunmugamAiyappan]

Failed to set error notification.
E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\webpack-dev-server\lib\Server.js:29
const validationErrors = webpack.validateSchema(optionsSchema, options);
^

TypeError: webpack.validateSchema is not a function
at new Server (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\webpack-dev-server\lib\Server.js:29:35)
at exports.default (E:/Projects/FrontEnd/Incentivio/isomorphic500/webpack/server.js:24:28)
at E:\Projects\FrontEnd\Incentivio\isomorphic500\index.js:16:32
at Server. (E:/Projects/FrontEnd/Incentivio/isomorphic500/src/server.js:81:50)
at Server.g (events.js:292:16)
at emitNone (events.js:86:13)
at Server.emit (events.js:185:7)
at emitListeningNT (net.js:1284:10)
at _combinedTickCallback (internal/process/next_tick.js:77:11)
at process._tickCallback (internal/process/next_tick.js:104:9)
31 Aug 10:04:21 - [nodemon] app crashed - waiting for file changes before starting...