Game won't open getting windows 10 store error

Welcome to the King Community.

Your App Store has probably not been updated so you need to update the App Store first.

On the Start screen, click the Store icon. In the Store screen, point to (but do not click) the lower-right or top-right corner of the screen, and click to select the Settings charm. In the Settings screen, click App updates. In the App updates screen, to manually update apps, click the Check for updates button.

The reinstall process may be the best.😊

You can check out some troubleshooting below.

Reset / clear cache data from app store - check app update - log out of game - restart device - open game and log in.