Error with starting App on Ionic

@Sapphire317 wrote:

OS: Windows10 (x64)
Node js Version: 9.3.0
Ionic Version:3.19.0

I followed guideline on Ionic homepage step by step.
But the error occurs when I try to start new Ionic Apps.
I repeated deleting and re-installing so many times, but same result.
what am I supposed to do?

These are commands that I entered.

npm install -g cordova ionic

ionic start myApp tabs

And These are errors after that.

× Running command - failed!
[ERROR] An error occurred while running npm i (exit code 1):

    > node-sass@4.5.3 install C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\node-sass
    > node scripts/install.js

    Downloading binary from https://github.com/sass/node-sass/releases/download/v4.5.3/win32-x64-59_binding.node
    Cannot download "https://github.com/sass/node-sass/releases/download/v4.5.3/win32-x64-59_binding.node":

    HTTP error 404 Not Found

    Hint: If github.com is not accessible in your location
           try setting a proxy via HTTP_PROXY, e.g.

           export HTTP_PROXY=http://example.com:1234

    or configure npm proxy via

           npm config set proxy http://example.com:8080

    > uglifyjs-webpack-plugin@0.4.6 postinstall C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\uglifyjs-webpack-plugin
    > node lib/post_install.js


    > node-sass@4.5.3 postinstall C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\node-sass
    > node scripts/build.js

    Building: C:\Program Files\nodejs\node.exe C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\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:\\Program Files\\nodejs\\node.exe',
    gyp verb cli   'C:\\Users\\sdw90\\Desktop\\Hybrid App\\Ionic\\MyApp\\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 node-gyp@3.6.2
    gyp info using node@9.3.0 | 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:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\which\which.js:13:12)
    gyp verb `which` failed     at F (C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\which\which.js:68:19)
    gyp verb `which` failed     at E (C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\which\which.js:80:29)
    gyp verb `which` failed     at C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\which\which.js:89:16
    gyp verb `which` failed     at C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\isexe\index.js:42:5
    gyp verb `which` failed     at C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\isexe\windows.js:36:5
    gyp verb `which` failed     at FSReqWrap.oncomplete (fs.js:166:21)
    gyp verb `which` failed  python2 { Error: not found: python2
    gyp verb `which` failed     at getNotFoundError (C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\which\which.js:13:12)
    gyp verb `which` failed     at F (C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\which\which.js:68:19)
    gyp verb `which` failed     at E (C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\which\which.js:80:29)
    gyp verb `which` failed     at C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\which\which.js:89:16
    gyp verb `which` failed     at C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\isexe\index.js:42:5
    gyp verb `which` failed     at C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\isexe\windows.js:36:5
    gyp verb `which` failed     at FSReqWrap.oncomplete (fs.js:166:21)
    gyp verb `which` failed   stack: 'Error: not found: python2\n    at getNotFoundError
    (C:\\Users\\sdw90\\Desktop\\Hybrid App\\Ionic\\MyApp\\node_modules\\which\\which.js:13:12)\n    at F
    (C:\\Users\\sdw90\\Desktop\\Hybrid App\\Ionic\\MyApp\\node_modules\\which\\which.js:68:19)\n    at E
    (C:\\Users\\sdw90\\Desktop\\Hybrid App\\Ionic\\MyApp\\node_modules\\which\\which.js:80:29)\n    at
    C:\\Users\\sdw90\\Desktop\\Hybrid App\\Ionic\\MyApp\\node_modules\\which\\which.js:89:16\n    at
    C:\\Users\\sdw90\\Desktop\\Hybrid App\\Ionic\\MyApp\\node_modules\\isexe\\index.js:42:5\n    at
    C:\\Users\\sdw90\\Desktop\\Hybrid App\\Ionic\\MyApp\\node_modules\\isexe\\windows.js:36:5\n    at
    FSReqWrap.oncomplete (fs.js:166:21)',
    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 (C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\which\which.js:13:12)
    gyp verb `which` failed     at F (C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\which\which.js:68:19)
    gyp verb `which` failed     at E (C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\which\which.js:80:29)
    gyp verb `which` failed     at C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\which\which.js:89:16
    gyp verb `which` failed     at C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\isexe\index.js:42:5
    gyp verb `which` failed     at C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\isexe\windows.js:36:5
    gyp verb `which` failed     at FSReqWrap.oncomplete (fs.js:166:21)
    gyp verb `which` failed  python { Error: not found: python
    gyp verb `which` failed     at getNotFoundError (C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\which\which.js:13:12)
    gyp verb `which` failed     at F (C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\which\which.js:68:19)
    gyp verb `which` failed     at E (C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\which\which.js:80:29)
    gyp verb `which` failed     at C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\which\which.js:89:16
    gyp verb `which` failed     at C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\isexe\index.js:42:5
    gyp verb `which` failed     at C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\isexe\windows.js:36:5
    gyp verb `which` failed     at FSReqWrap.oncomplete (fs.js:166:21)
    gyp verb `which` failed   stack: 'Error: not found: python\n    at getNotFoundError
    (C:\\Users\\sdw90\\Desktop\\Hybrid App\\Ionic\\MyApp\\node_modules\\which\\which.js:13:12)\n    at F
    (C:\\Users\\sdw90\\Desktop\\Hybrid App\\Ionic\\MyApp\\node_modules\\which\\which.js:68:19)\n    at E
    (C:\\Users\\sdw90\\Desktop\\Hybrid App\\Ionic\\MyApp\\node_modules\\which\\which.js:80:29)\n    at
    C:\\Users\\sdw90\\Desktop\\Hybrid App\\Ionic\\MyApp\\node_modules\\which\\which.js:89:16\n    at
    C:\\Users\\sdw90\\Desktop\\Hybrid App\\Ionic\\MyApp\\node_modules\\isexe\\index.js:42:5\n    at
    C:\\Users\\sdw90\\Desktop\\Hybrid App\\Ionic\\MyApp\\node_modules\\isexe\\windows.js:36:5\n    at
    FSReqWrap.oncomplete (fs.js:166:21)',
    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 PythonFinder.failNoPython (C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\node-gyp\lib\configure.js:483:19)
    gyp ERR! stack     at PythonFinder.<anonymous> (C:\Users\sdw90\Desktop\Hybrid
    App\Ionic\MyApp\node_modules\node-gyp\lib\configure.js:508:16)
    gyp ERR! stack     at C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\graceful-fs\polyfills.js:284:29
    gyp ERR! stack     at FSReqWrap.oncomplete (fs.js:166:21)
    gyp ERR! System Windows_NT 10.0.16299
    gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\sdw90\\Desktop\\Hybrid
    App\\Ionic\\MyApp\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild" "--verbose" "--libsass_ext="
    "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
    gyp ERR! cwd C:\Users\sdw90\Desktop\Hybrid App\Ionic\MyApp\node_modules\node-sass
    gyp ERR! node -v v9.3.0
    gyp ERR! node-gyp -v v3.6.2
    gyp ERR! not ok
    Build failed with error code: 1
    npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 (node_modules\fsevents):
    npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted
    {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

    npm ERR! code ELIFECYCLE
    npm ERR! errno 1
    npm ERR! node-sass@4.5.3 postinstall: `node scripts/build.js`
    npm ERR! Exit status 1
    npm ERR!
    npm ERR! Failed at the node-sass@4.5.3 postinstall script.
    npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

    npm ERR! A complete log of this run can be found in:
    npm ERR!     C:\Users\sdw90\AppData\Roaming\npm-cache\_logs\2018-01-06T08_57_38_638Z-debug.log

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