I have been getting this error with the store today. Also there is no little thumbnail where the latest store offer usually is on the main screen. I have tried to close and reload the game several times and to no avail.
Our stores are connected to their respective iOS or Google stores. Occasionally those Stores will have unexpected connection issues that resolve themselves after some time has passed. If this is still an issue for you, I know some players have had success making sure all their Google Playstore related apps are up to date.