unable to start grunt

[netalex]

node 6 installed ex novo, buuild with some warning, this is the output of error log in "npm install"

"0 info it worked if it ends with ok
1 verbose cli [ 'C:\Program Files\nodejs\node.exe',
1 verbose cli 'C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js',
1 verbose cli 'start' ]
2 info using npm@3.10.3
3 info using node@v6.6.0
4 verbose run-script [ 'prestart', 'start', 'poststart' ]
5 info lifecycle sb-admin@0.0.0prestart: sb-admin@0.0.0
6 silly lifecycle sb-admin@0.0.0prestart: no script for prestart, continuing
7 info lifecycle sb-admin@0.0.0start: sb-admin@0.0.0
8 verbose lifecycle sb-admin@0.0.0start: unsafe-perm in lifecycle true
9 verbose lifecycle sb-admin@0.0.0start: PATH: C:\Program Files\nodejs\node_modules\npm\bin\node-gyp-bin;[root]\node_modules.bin;C:\Program Files\nodejs;[userdir]bin;C:\Program Files\Git\mingw32\bin;C:\Program Files\Git\usr\local\bin;C:\Program Files\Git\usr\bin;C:\Program Files\Git\usr\bin;C:\Program Files\Git\mingw32\bin;C:\Program Files\Git\usr\bin;[userdir]bin;C:\Ruby22-x64\bin;C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\Lenovo\FusionEngine;C:\Program Files (x86)\Intel\iCLS Client;C:\Program Files\Intel\iCLS Client;C:\windows\system32;C:\windows;C:\windows\System32\Wbem;C:\windows\System32\WindowsPowerShell\v1.0;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Common Files\lenovo\easyplussdk\bin;C:\Program Files (x86)\Lenovo\Password Manager;[userdir].dnx\bin;C:\Program Files\Microsoft DNX\Dnvm;C:\Program Files\Microsoft SQL Server\120\Tools\Binn;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit;C:\Program Files (x86)\Skype\Phone;C:\Program Files (x86)\WinMerge;C:\Program Files (x86)\Heroku\bin;C:\Program Files (x86)\git\cmd;C:\Program Files\Git\cmd;C:\Program Files\TortoiseSVN\bin;C:\Program Files (x86)\Google\Cloud SDK\google-cloud-sdk\bin;C:\Program Files (x86)\PuTTY;C:\Program Files (x86)\WinSCP;C:\Program Files (x86)\Brackets\command;C:\Program Files\nodejs;[userdir]AppData\Local\atom\bin;[userdir]AppData\Local\Pandoc;[userdir]AppData\Local\Apps\cURL\bin;[userdir]AppData\Roaming\npm;C:\Program Files\Git\usr\bin\vendor_perl;C:\Program Files\Git\usr\bin\core_perl
10 verbose lifecycle sb-admin@0.0.0start: CWD: [root]
11 silly lifecycle sb-admin@0.0.0start: Args: [ '/d /s /c', 'grunt serve' ]
12 silly lifecycle sb-admin@0.0.0start: Returned: code: 1 signal: null
13 info lifecycle sb-admin@0.0.0~start: Failed to exec start script
14 verbose stack Error: sb-admin@0.0.0 start: grunt serve
14 verbose stack Exit status 1
14 verbose stack at EventEmitter. (C:\Program Files\nodejs\node_modules\npm\lib\utils\lifecycle.js:242:16)
14 verbose stack at emitTwo (events.js:106:13)
14 verbose stack at EventEmitter.emit (events.js:191:7)
14 verbose stack at ChildProcess. (C:\Program Files\nodejs\node_modules\npm\lib\utils\spawn.js:40:14)
14 verbose stack at emitTwo (events.js:106:13)
14 verbose stack at ChildProcess.emit (events.js:191:7)
14 verbose stack at maybeClose (internal/child_process.js:877:16)
14 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:226:5)
15 verbose pkgid sb-admin@0.0.0
16 verbose cwd [root]
17 error Windows_NT 6.3.9600
18 error argv "C:\Program Files\nodejs\node.exe" "C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js" "start"
19 error node v6.6.0
20 error npm v3.10.3
21 error code ELIFECYCLE
22 error sb-admin@0.0.0 start: grunt serve
22 error Exit status 1
23 error Failed at the sb-admin@0.0.0 start script 'grunt serve'.
23 error Make sure you have the latest version of node.js and npm installed.
23 error If you do, this is most likely a problem with the sb-admin package,
23 error not with npm itself.
23 error Tell the author that this fails on your system:
23 error grunt serve
23 error You can get information on how to open an issue for this project with:
23 error npm bugs sb-admin
23 error Or if that isn't available, you can get their info via:
23 error npm owner ls sb-admin
23 error There is likely additional logging output above.
24 verbose exit [ 1, true ]
"