core.js:13987 'app-flower-spinner' is not a known element:

 ```
 <app-atom-spinner [animationDuration]="animationDuration" [size]="100" [color]="'#ff1d5e'"
 ></app-atom-spinner>
```
The above is working but when I added the below one it throws an error of  'core.js:13987 'app-flower-spinner' is not a known element:'.
```
 <app-flower-spinner
 [animationDuration]="2500"
 [size]="70"
 [color]="'#ff1d5e'"
></app-flower-spinner>
```