Hello! I understand that since yesterday you're unable to log into the BuBiM app due to the message “Server nicht erreichbar” (Server not reachable). Let's work together to get this sorted out.

First, could you let me know a bit more about the situation?

- Are you connected via Wi-Fi or mobile data?
- Have you tried switching between these connections?
- Have you checked if other internet-based apps on your device are working fine?
- Also, have you tried restarting your device or reinstalling the BuBiM app?

Sometimes, this error can be caused by a network hiccup, account synchronization issues, or even temporary server outages.

Here’s a step-by-step plan to try:

1. Check Internet Connection: Make sure your device has an active and stable internet connection. Try visiting a website or using another app that requires internet to confirm. If you’re on Wi-Fi, try toggling Wi-Fi off and on or switch to mobile data.

2. Restart Your Device: Sometimes a simple reboot can refresh network settings and app connections.

3. Update the BuBiM App: Ensure your app is updated to the latest version from Google Play Store. Outdated versions might face server access problems.

4. Clear App Cache and Data:
- Go to Settings > Apps > BuBiM
- Tap on Storage
- Select Clear Cache and then Clear Data (Note: clearing data will log you out, so keep your login credentials handy).
- Then, try logging in again.

5. Reinstall the App: If the above doesn’t help, uninstall the BuBiM app and reinstall it fresh.

6. Server Status: Sometimes, the problem might be on the server side. If the problem persists after trying the above, it could be a temporary issue with the BuBiM servers. I can look into current reports or known outages.

Could you please try these steps and tell me what happens at each stage? That way, I can help you better.

Are you connected over Wi-Fi or mobile data currently?