Unable To Cast To Device

When trying to cast a tab with Google Chromecast, you get:

Unable to cast to device.
An unexpected error occurred. Please try the following:
Try to cast again
Verify your network connectivity

Usually trying to cast again will work, but if you still get the error and are unable to cast to the Chromecast device, it may be that there’s some sort of pop up advert on the video you are trying to cast. Look for a little “x” to close the advert, which may be overlayed on the video.

Failing this, if you are still unable to cast to your device, reboot the TV and computer, then try again.