Bootstrap vs Angular 2: ERROR in multi script-loader! Module not found: Error: /~/bootstrap/dist/js/bootstrap.js

Question

I created a new Angular 2 project with ng new klw

1. I installed bootstrap: npm install bootstrap@next

2. added style and scripts into angular

   "styles": [
       "styles.css",
   "../node_modules/bootstrap/dist/css/bootstrap.css"
     ],
     "scripts": [
   "../node_modules/jquery/dist/jquery.js",
   "../node_modules/tether/dist/js/tether.js",
   "../node_modules/bootstrap/dist/js/bootstrap.js"
     ],
   

3. Integrated bootstrap 4 to angular-cli: npm install --save @ng-bootstrap/ngbootstrap

4. added NgbModule import into app.module.ts
5. added to import section NgbModule into app.module.ts
6. modified app.module.html added: <NgbAlert> Alert text </NgbAlert>

Which was what I missed to do?

When I run ng serve I got the following ERRORS:

ERROR in Error encountered resolving symbol values statically. Could not resolve @ng-bootstrap/ng-bootstrap relative to F:/src/prjs/angular2/pilot/klw/src/app/app.module.ts., resolving symbol AppModule in F:/src/prjs/angular2/pilot/klw/src/app/app.module.ts, resolving symbol AppModule in F:/src/prjs/angular2/pilot/klw/src/app/app.module.ts

ERROR in multi script-loader!./~/jquery/dist/jquery.js script-loader!./~/tether/dist/js/tether.js script-loader!./~/bootstrap/dist/js/bootstrap.js
Module not found: Error: Can't resolve 'F:\src\prjs\angular2\pilot\klw\node_modules\jquery\dist\jquery.js' in 'F:\src\prjs\angular2\pilot\klw'
 @ multi script-loader!./~/jquery/dist/jquery.js script-loader!./~/tether/dist/js/tether.js script-loader!./~/bootstrap/dist/js/bootstrap.js

ERROR in multi script-loader!./~/jquery/dist/jquery.js script-loader!./~/tether/dist/js/tether.js script-loader!./~/bootstrap/dist/js/bootstrap.js
Module not found: Error: Can't resolve 'F:\src\prjs\angular2\pilot\klw\node_modules\tether\dist\js\tether.js' in 'F:\src\prjs\angular2\pilot\klw'

ERROR in multi script-loader!./~/jquery/dist/jquery.js script-loader!./~/tether/dist/js/tether.js script-loader!./~/bootstrap/dist/js/bootstrap.js
Module not found: Error: Can't resolve 'F:\src\prjs\angular2\pilot\klw\node_modules\tether\dist\js\tether.js' in 'F:\src\prjs\angular2\pilot\klw'
 @ multi script-loader!./~/jquery/dist/jquery.js script-loader!./~/tether/dist/js/tether.js script-loader!./~/bootstrap/dist/js/bootstrap.js

ERROR in multi script-loader!./~/jquery/dist/jquery.js script-loader!./~/tether/dist/js/tether.js script-loader!./~/bootstrap/dist/js/bootstrap.js
Module not found: Error: Can't resolve 'F:\src\prjs\angular2\pilot\klw\node_modules\bootstrap\dist\js\bootstrap.js' in 'F:\src\prjs\angular2\pilot\klw'
 @ multi script-loader!./~/jquery/dist/jquery.js script-loader!./~/tether/dist/js/tether.js script-loader!./~/bootstrap/dist/js/bootstrap.js

ERROR in multi ./src/styles.css ./~/bootstrap/dist/css/bootstrap.css
Module not found: Error: Can't resolve 'F:\src\prjs\angular2\pilot\klw\node_modules\bootstrap\dist\css\bootstrap.css' in 'F:\src\prjs\angular2\pilot\klw'
 @ multi ./src/styles.css ./~/bootstrap/dist/css/bootstrap.css

ERROR in F:/src/prjs/angular2/pilot/klw/src/app/app.module.ts (8,25): Cannot find module '@ng-bootstrap/ng-bootstrap'.)

ERROR in ./src/app/app.module.ts
Module not found: Error: Can't resolve '@ng-bootstrap/ng-bootstrap' in 'F:\src\prjs\angular2\pilot\klw\src\app'
 @ ./src/app/app.module.ts 15:0-55
 @ ./src/main.ts
 @ multi webpack-dev-server/client?http://localhost:4200/ ./src/main.ts
webpack: Failed to compile.

Answer 1

1. remove symbol ^ for @angular/cdk and @angular/material in package.json
2. remove node_modules and package-lock.json
3. npm cache clean -f
4. npm i

It works in my case. Hope it helps you