Add the Auth plugin before calling `Amplify.configure`. Update [the code you added](/lib-v1/project-setup/create-application#n4-initialize-amplify-in-the-application) in **Prerequisites**: 

<BlockSwitcher>
<Block name="Java">

```java
// Add this line, to include the Auth plugin.
Amplify.addPlugin(new AWSCognitoAuthPlugin());
Amplify.configure(getApplicationContext());
```

</Block>
<Block name="Kotlin - Callbacks">

```kotlin
// Add this line, to include the Auth plugin.
Amplify.addPlugin(AWSCognitoAuthPlugin())
Amplify.configure(applicationContext)
```

</Block>
<Block name="Kotlin - Coroutines">

```kotlin
// Add this line, to include the Auth plugin.
Amplify.addPlugin(AWSCognitoAuthPlugin())
Amplify.configure(applicationContext)
```

</Block>
<Block name="RxJava">

```java
// Add this line, to include the Auth plugin.
RxAmplify.addPlugin(new AWSCognitoAuthPlugin());
RxAmplify.configure(getApplicationContext());
```

</Block>
</BlockSwitcher>