SharePoint Apps requires the following Services to be running:
- App Management Service
- Subscription Service
Ensure Services are Running
You can open Central Administration > Manage Services link as shown below.
In the appearing page, ensure the following services are Started.
If they are not started, click the Start link to start them.
Note: If any of the services are not running, you will get the following error message.
“The Subscription Settings service and corresponding application and proxy needs to be running in order to make changes to these settings”