class is a standalone component, which can not be used in the `@NgModule.bootstrap` array in...

i got this error when i tried adding bootstrap to my angular project :

The MainComponent class is a standalone component, which can not be used in the @NgModule.bootstrap array. Use the bootstrapApplication function for bootstrap instead
​

exactly in app.module file

bootstrap:[MainComponent] }) export class AppModule { }

How to fix this error in order to use bootstrap in my application, thanks in advance

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