NgbModule has not been processed correctly by ngcc

I am working on a new angular application, I’ve installed ng-bootstrap by using:

npm install --save @ng-bootstrap/ng-bootstrap

After adding NgbModule to app.module.ts I am getting the following error:

ERROR in node_modules/@ng-bootstrap/ng-bootstrap/index.d.ts:20:22 - error NG6002: Appears in the NgModule.imports of AppModule, but could not be resolved to an NgModule class. This likely means that the library (@ng-bootstrap/ng-bootstrap) which declares NgbModule has not been processed correctly by ngcc, or is not compatible with Angular Ivy. Check if a newer version of the library is available, and update if so. Also consider checking with the library’s authors to see if the library is expected to be compatible with Ivy. 20 export declare class NgbModule {

Angular CLI: 9.1.0
Node: 12.16.1
OS: win32 x64
Ivy Workspace: Yes
npm: 6.13.4
"@ng-bootstrap/ng-bootstrap": "^6.0.2"

[Abdulrahman-Falyoun]

@maxokorokov clearing the cache and removing and reinstalling node_modules solved it, many thanks.

[anand94a]

The order in which I executed the commands within the project created are as follows:

ng add @ng-bootstrap/ng-bootstrap

npm install --save @ng-bootstrap/ng-bootstrap

It worked for me.