Ruby on Rails

Angular2 Installing main plugins using angular cli steps? 1)npm i -D @angular-devkit/core 2)npm install jquery --save (or) npm install bootstrap@3 jquery --save 3)npm install -D @types/jquery 4)npm install font-awesome --save 5) npm install moment --save 6)npm install --save angular2-daterangepicker (Not there from source download) -> http://www.daterangepicker.com/#config 7)https://www.npmjs.com/package/ng2-highcharts  i)npm install --save highcharts@^4.2.1  ii)npm install @types/highcharts --save  iii)npm install --save ng2-highcharts 8)npm install ngx-pagination --save(https://github.com/michaelbromley/ngx-pagination) 9)npm install -D @types/bootstrap 10)npm install --save @types/daterangepicker

Angular 2 Error: Cannot find module '@angular-devkit/core ? npm i -D @angular-devkit/core