If you see an error on your Apple TV that says
Already playing another movie. (145)
It typically points to information stored on the device that needs to be refreshed. Follow the troubleshooting steps below to resolve the issue.
If you share your Netflix account with other people, they may be using Netflix at the same time you're trying to watch. The number of people who can stream at the same time depends on your Netflix plan.
To solve this problem, make sure that no one else is using your account before trying to watch again.
Sometimes the Netflix app thinks it's still playing something even though it's not.
To solve this problem, try again later. The error message will go away on its own, but it may take up 2 hours.
Unplug your Apple TV and the TV it's connected to from power for at least 2 minutes.
Plug both devices back in.
Turn both devices back on.
Try Netflix again.
Sometimes the Netflix app thinks it's playing a TV show or movie even though it's not. It's pretty rare, but in these cases, just wait two to three hours and try your title again.