Can't install on Windows

I have NodeJs 6.2 installed on my PC but can't install wcpack. I am getting this error:
gyp ERR! build error
gyp ERR! stack Error: `C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe` failed with exit code: 3762504530
gyp ERR! stack     at ChildProcess.onExit (C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\lib\build.js:2
76:23)
gyp ERR! stack     at emitTwo (events.js:106:13)
gyp ERR! stack     at ChildProcess.emit (events.js:191:7)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:204:12)
gyp ERR! System Windows_NT 10.0.10586
gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\node_modules\\node
-gyp\\bin\\node-gyp.js" "rebuild"
gyp ERR! cwd C:\Users\Lev\AppData\Roaming\npm\node_modules\wcpack\node_modules\contextify
gyp ERR! node -v v6.2.0
gyp ERR! node-gyp -v v3.3.1
gyp ERR! not ok
C:\Users\Lev\AppData\Roaming\npm
`-- (empty)

npm ERR! Windows_NT 10.0.10586
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "ins
tall" "-g" "wcpack"
npm ERR! node v6.2.0
npm ERR! npm  v3.8.9
npm ERR! code ELIFECYCLE

npm ERR! contextify@0.1.15 install: `node-gyp rebuild`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the contextify@0.1.15 install script 'node-gyp rebuild'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the contextify package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node-gyp rebuild
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs contextify
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls contextify
npm ERR! There is likely additional logging output above.
matthewp / webcomponent-pack

Can't install on Windows #4
