What should I do if cleaning the game card and restarting the console doesn't fix the error?

If basic troubleshooting fails, ensure your Nintendo Switch system software is up to date. Go to 'System Settings' > 'System' > 'System Update'. If the issue persists, try formatting the console's cache (this won't delete save data) via 'System Settings' > 'System' > 'Formatting Options' > 'Clear Cache'. As a last resort before contacting support, you might consider initializing the console without deleting save data, though this is less common for game card errors and should be approached with caution, ensuring all important data is backed up or cloud-saved.