Error 8015008 occurs when changing your Xbox Microsoft account on your console

You see the following error code when you try to change your Xbox Microsoft account on your console.

Error code: 8015008

This may mean that you have to clear the cache on the Xbox 360 console.

To resolve this problem, follow these steps:

1. Press the Guide button on your controller.
2. Go to Settings and select System Settings.
3. Select Storage or Memory.

4. Highlight any storage device, and then press Y on your controller. (It doesn't matter which storage device you select; the cache will be cleared for all storage devices.)
5. Select Clear System Cache.

6. When you’re prompted to confirm storage device maintenance, select Yes.

If you still experience the problem, contact Xbox Support.