This error (in Google Play Store) is caused when your device is not synchronized with the Google servers.
Some things you could do to fix it are:
1. Logout of your present Google account under Settings > Accounts and re-login or login to a different Google account
2. Clear data and cache under Settings > Apps > All > Google Play Store
3. Disable / uninstall all proxy applications
4. Factory reset either in recovery mode or under Settings > Storage