How to fix error 'Oops, shouldn't be here' on Chromecast
How to resolvePress the reset button on your Chromecast device for around 20–25 seconds. Then try using it again.
NOW TV won’t be able to resolve this issue. It can appear when you use other apps on your Chromecast device as well.
Help tip Any message that appears on your TV when using your Chromecast is a Google Chromecast message. Any message that appears on your iOS or Android device when using your Chromecast is a NOW TV message.