ERROR Error: Uncaught (in promise): NullInjectorError: R3InjectorError(AppModule)[AuthGuard -> StorageService -> Storage -> Storage]: NullInjectorError: No provider for Storage!

hey i'm facing this error
```
ERROR Error: Uncaught (in promise): NullInjectorError: R3InjectorError(AppModule)[AuthGuard -> StorageService -> Storage -> Storage]:
NullInjectorError: No provider for Storage!
NullInjectorError: R3InjectorError(AppModule)[AuthGuard -> StorageService -> Storage -> Storage]:
NullInjectorError: No provider for Storage!
at NullInjector.get (core.mjs:8771:27)
at R3Injector.get (core.mjs:9200:33)
at R3Injector.get (core.mjs:9200:33)
at injectInjectorOnly (core.mjs:652:33)
```

here is the service i have created
````
import { Injectable } from '@angular/core';

import { Storage } from '@ionic/storage-angular';

@Injectable({
providedIn: 'root'
})
export class StorageService {
private _storage: Storage;

constructor(private storage: Storage) {
this.init();
}

async init() {
// If using, define drivers here: await this.storage.defineDriver(/*...*/);
const storage = await this.storage.create();
this._storage = storage;
this._storage.set('isAdmin',false);
this._storage.set('token','');
}

// Create and expose methods that users of this service can
// call, for example:
public set(key: string, value: any) {
this._storage?.set(key, value);
}

public get(key: string){
return this._storage?.get(key);
}
}
````