To resolve the "generic digital order error" in the Subway app, follow these detailed steps:

1. Change Your Location:
- Open the Subway app and go to your account settings.
- Change your location to another Subway restaurant. This action often resets your cart, which could eliminate the error. After changing the location, switch back to your original location to check if the problem persists - learn more.

2. Update the App:
- Ensure you are using the latest version of the Subway app. Check for updates in the Google Play Store or Apple App Store.
- Updating can resolve many bugs, including those related to order processing - learn more.

3. Clear Cache and Data:
- On Android, go to Settings > Apps > Subway > Storage and select "Clear Cache" and "Clear Data".
- For iPhone users, you may need to delete and reinstall the app to clear its data, as there is no direct method to clear the cache - learn more.

4. Network Connection:
- Check your internet connection. A weak connection can cause issues with processing orders.
- Try switching from Wi-Fi to mobile data or vice versa to see if that resolves the issue - learn more.

5. Try Ordering Again:
- After performing the above steps, try placing your order again. If the error appears again, consider ordering directly through the Subway website as a temporary workaround - learn more.

6. Contact Support:
- If none of these steps work, contact Subway customer support for assistance. They can provide more specific troubleshooting related to your account and order history - learn more.

By following these steps, you should be able to address the "generic digital order error" effectively. If the error continues after trying these solutions, it may indicate a more significant issue with the app that needs to be resolved by Subway’s technical team.