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@name Root element was not found.
@category runtime
@shortDescription Root element was not found during bootstrap.
@description
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Bootstrapped components are defined in the `bootstrap` property of an `@NgModule` decorator or as the first parameter of `bootstrapApplication` for standalone components.
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This error happens when Angular tries to bootstrap one of these components but cannot find its corresponding node in the DOM.
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@debugging
This issue occurs when the selector mismatches the tag
```typescript
@Component ({
selector: 'my-app',
...
})
class AppComponent {}
```
```html
< html >
< app-root > < / app-root > <!-- Doesn't match the selector -->
< / html >
```
Replace the tag with the correct one:
```html
< html >
< my-app > < / my-app > <!-- OK -->
< / html >
```
