Hi there! I'm here to help you with the login issue you're experiencing with VRoid Mobile. It can be a bit tricky sometimes. Could you please let me know if you've seen any specific error messages beyond just "application error"? Also, have you tried any troubleshooting steps so far, like restarting your device or checking your internet connection?

Let’s work through a few steps together:

1. Check Internet Connection: Ensure that you're connected to a stable internet connection. You can try switching between Wi-Fi and mobile data.

2. Clear App Cache and Data:
- Go to Settings on your Android device.
- Then navigate to Apps or Application Manager.
- Find and select VRoid Mobile.
- Look for Storage, and then tap on Clear Cache and Clear Data.
- Restart your device afterwards and try to log in again.

3. Browser Settings: Since you mentioned you're facing an error, try switching your browser to Chrome if you're using a different one. VRoid has a better compatibility with Chrome.

4. Update App and Device: Make sure you have the latest version of the VRoid app installed. Also, check if your Android version is up-to-date (you mentioned you’re on Android 10; there might be updates available).

5. Reinstall the App: If the issue persists, consider uninstalling and then reinstalling the VRoid Mobile app.

If you've already tried these steps or are still experiencing the issue, let me know! We can explore some advanced troubleshooting or check for any potential outages.