NullInjectorError：R3InjectorError（AppModule）[ComponentLoaderFactory-> ComponentLoaderFactory-> ComponentLoaderFactory]

Question

也我在app.module.ts中导入模块，但它在控制台中引发以下错误并成功编译

main.ts:12 NullInjectorError: R3InjectorError(AppModule)[ComponentLoaderFactory -> ComponentLoaderFactory -> ComponentLoaderFactory]: 
  NullInjectorError: No provider for ComponentLoaderFactory!
    at NullInjector.get (http://localhost:4200/vendor.js:17796:27)
    at R3Injector.get (http://localhost:4200/vendor.js:31509:33)
    at R3Injector.get (http://localhost:4200/vendor.js:31509:33)
    at R3Injector.get (http://localhost:4200/vendor.js:31509:33)
    at NgModuleRef$1.get (http://localhost:4200/vendor.js:48851:33)
    at Object.get (http://localhost:4200/vendor.js:46693:35)
    at getOrCreateInjectable (http://localhost:4200/vendor.js:21303:39)
    at Module.ɵɵdirectiveInject (http://localhost:4200/vendor.js:35426:12)
    at NodeInjectorFactory.BsDropdownDirective_Factory [as factory] (http://localhost:4200/vendor.js:74670:545)
    at getNodeInjectable (http://localhost:4200/vendor.js:21448:44)