Hi there! I'm sorry to hear that you're having trouble with the Readoo app not opening. I can understand how frustrating that can be. Let's try to figure this out together.

To start, could you let me know what happens when you try to open the app? Do you see any error messages, or does it just close unexpectedly? This will help me guide you better.

In the meantime, here are a few steps that you can try:

1. Restart Your Device: Sometimes a simple restart can resolve temporary glitches. Just turn off your device, wait a few seconds, and turn it back on.

2. Clear Cache and Data:
- Go to Settings on your device.
- Scroll down and select Apps or Applications.
- Find and tap on Readoo.
- Tap on Storage and then choose both Clear Cache and Clear Data. (Note that clearing data may reset your preferences within the app.)

3. Reinstall the App:
- If the issue persists after clearing cache and data, consider uninstalling the app.
- After that, restart your device again, and then download Readoo from the Google Play Store to reinstall it.

4. Check for Updates: Make sure that your device's operating system and the Readoo app are both updated to the latest versions available. Sometimes, compatibility issues can arise from using outdated software.

Please let me know if any of these steps help or if you'd like me to assist you further!