title: StaticInjectionError in ng-bootstrap
body: <p>Need to implement a rating system in my project so i tried with ng-bootstrap modules and used below code:</p>
  
  <pre><code>&lt;ngb-rating [(rate)]="currentRate"&gt;&lt;/ngb-rating&gt;
  </code></pre>
  
  <p>But it makes error while running on browser:</p>
  
  <pre><code>ng:///AppModule/SearchResultsComponent.ngfactory.js:55 ERROR Error: StaticInjectorError[NgbRatingConfig]: 
    StaticInjectorError[NgbRatingConfig]: 
      NullInjectorError: No provider for NgbRatingConfig!
      at _NullInjector.get (webpack-internal:///../../../core/esm5/core.js:1190)
      at resolveToken (webpack-internal:///../../../core/esm5/core.js:1478)
      at tryResolveToken (webpack-internal:///../../../core/esm5/core.js:1420)
      at StaticInjector.get (webpack-internal:///../../../core/esm5/core.js:1291)
      at resolveToken (webpack-internal:///../../../core/esm5/core.js:1478)
      at tryResolveToken (webpack-internal:///../../../core/esm5/core.js:1420)
      at StaticInjector.get (webpack-internal:///../../../core/esm5/core.js:1291)
      at resolveNgModuleDep (webpack-internal:///../../../core/esm5/core.js:11075)
      at NgModuleRef_.get (webpack-internal:///../../../core/esm5/core.js:12307)
      at resolveDep (webpack-internal:///../../../core/esm5/core.js:12805)
  </code></pre>