While I was trying to take a screenshot through my iPad 3, I turned off the device for about 3 times. Since then, I am not able to use the Kindle app on it. Even though the app does shows the sign in page, the ‘internal error’ message will be displayed after signing into the app. It is not possible to re-install the app after deleting it as I keep getting the same error message. What should I do to resolve this issue?