# Activate an App Block
<a name="appstream-app-blocks-activate"></a>

If an app block with WorkSpaces Applications packaging was created, but the application package (VHD) was not attached to it, then the app block will be in an inactive state, and it can't be used to associate applications with Elastic fleets. To activate an app block, an application package (VHD) must be associated with the app block.

**To create the application package**

1. Open the WorkSpaces Applications console at [https://console.aws.amazon.com/appstream2](https://console.aws.amazon.com/appstream2).

1. From the left-hand navigation menu, choose **Applications Manager**, **App blocks**. 

1. Select an **Inactive** app block that you want to activate, and choose **Activate** from the **Actions** menu.

1. Select an app block builder, and choose **Launch app block builder**. 
   + If the list is empty, then you either don’t have an app block builder, or all of your app block builders are associated with other app blocks. Either create a new app block builder, or disassociate an existing app block builder and test it. 
   + If the app block builder is already associated with an app block, then you can continue using it for activating the app block.
   + If the selected app block builder was not associated with an app block builder, then it will be associated with the one you select, and the streaming session will launch. The app block builder remains associated with this app block after the session ends. 

1. After the app block builder streaming session starts, follow the steps in [Step 2: Create the Application Package](appstream-app-blocks-create.md#appstream-app-blocks-create-step2) to create your application package (VHD) and activate the app block.