when i did changes related to moment in angular2-moment, i encounter these errors :(

errors_in_moment

ERROR in ./~/angular2-moment/calendar.pipe.js
Module not found: Error: Can't resolve 'moment' in 'C:\Users\MKumar\my-app\node_modules\angular2-moment'
 @ ./~/angular2-moment/calendar.pipe.js 4:13-30
 @ ./~/angular2-moment/index.js
 @ ./src/app/app.module.ts
 @ ./src/main.ts
 @ multi webpack-dev-server/client?http://localhost:4200 ./src/main.ts

ERROR in ./~/angular2-moment/difference.pipe.js
Module not found: Error: Can't resolve 'moment' in 'C:\Users\MKumar\my-app\node_modules\angular2-moment'
 @ ./~/angular2-moment/difference.pipe.js 4:13-30
 @ ./~/angular2-moment/index.js
 @ ./src/app/app.module.ts
 @ ./src/main.ts
 @ multi webpack-dev-server/client?http://localhost:4200 ./src/main.ts

ERROR in ./~/angular2-moment/from-unix.pipe.js
Module not found: Error: Can't resolve 'moment' in 'C:\Users\MKumar\my-app\node_modules\angular2-moment'
 @ ./~/angular2-moment/from-unix.pipe.js 4:13-30
 @ ./~/angular2-moment/index.js
 @ ./src/app/app.module.ts
 @ ./src/main.ts
 @ multi webpack-dev-server/client?http://localhost:4200 ./src/main.ts

ERROR in ./~/angular2-moment/duration.pipe.js
Module not found: Error: Can't resolve 'moment' in 'C:\Users\MKumar\my-app\node_modules\angular2-moment'
 @ ./~/angular2-moment/duration.pipe.js 3:13-30
 @ ./~/angular2-moment/index.js
 @ ./src/app/app.module.ts
 @ ./src/main.ts
 @ multi webpack-dev-server/client?http://localhost:4200 ./src/main.ts

ERROR in ./~/angular2-moment/subtract.pipe.js
Module not found: Error: Can't resolve 'moment' in 'C:\Users\MKumar\my-app\node_modules\angular2-moment'
 @ ./~/angular2-moment/subtract.pipe.js 4:13-30
 @ ./~/angular2-moment/index.js
 @ ./src/app/app.module.ts
 @ ./src/main.ts
 @ multi webpack-dev-server/client?http://localhost:4200 ./src/main.ts

ERROR in ./~/angular2-moment/date-format.pipe.js
Module not found: Error: Can't resolve 'moment' in 'C:\Users\MKumar\my-app\node_modules\angular2-moment'
 @ ./~/angular2-moment/date-format.pipe.js 4:13-30
 @ ./~/angular2-moment/index.js
 @ ./src/app/app.module.ts
 @ ./src/main.ts
 @ multi webpack-dev-server/client?http://localhost:4200 ./src/main.ts

ERROR in ./~/angular2-moment/add.pipe.js
Module not found: Error: Can't resolve 'moment' in 'C:\Users\MKumar\my-app\node_modules\angular2-moment'
 @ ./~/angular2-moment/add.pipe.js 4:13-30
 @ ./~/angular2-moment/index.js
 @ ./src/app/app.module.ts
 @ ./src/main.ts
 @ multi webpack-dev-server/client?http://localhost:4200 ./src/main.ts

ERROR in ./~/angular2-moment/time-ago.pipe.js
Module not found: Error: Can't resolve 'moment' in 'C:\Users\MKumar\my-app\node_modules\angular2-moment'
 @ ./~/angular2-moment/time-ago.pipe.js 4:13-30
 @ ./~/angular2-moment/index.js
 @ ./src/app/app.module.ts
 @ ./src/main.ts
 @ multi webpack-dev-server/client?http://localhost:4200 ./src/main.ts

ERROR in ./~/angular2-moment/utc.pipe.js
Module not found: Error: Can't resolve 'moment' in 'C:\Users\MKumar\my-app\node_modules\angular2-moment'
 @ ./~/angular2-moment/utc.pipe.js 3:13-30
 @ ./~/angular2-moment/index.js
 @ ./src/app/app.module.ts
 @ ./src/main.ts
 @ multi webpack-dev-server/client?http://localhost:4200 ./src/main.ts
webpack: Failed to compile.

these are the files

https://github.com/madurimanoj/ng-book2/tree/master/src/app