the error "Unknown calling package name 'com.google.android.gms'." is likely caused by issues with Google apps. Here are some steps to troubleshoot the issue: * Restart your phone: This might be enough to fix the problem. * Reinstall Google apps: Uninstall Google apps like Google Play Services and Google Play Store, then reinstall them. * Clear cache and data: Clear the cache and data for Google Play Services and Google Play Store.