This means that the information on the device that you are trying to cast needs to be refreshed. To fix this issue, follow the below steps and retry to cast -

Android phone or tablets

• Ensure that your android device and Chromecast are connected to same Wifi
• Restart your android phone or tablet
• Update Google Home and Google Play services
• Unplug your chromecast device from power source for 15s and plug it back to allow chromecast to reboot
• Sign out of Sony LIV

Windows or Mac computer

If you use chrome, you can turn off unnecessary add ons by following the below steps

• In the address bar, enter chrome://extensions
• Turn off any extensions that are turned on