We're sorry you're experiencing these problems. This is normally because the Google Text-to-Speech app is not installed on your device and selected as the default Text-to-Speech engine.
Here is how you can resolve this:
- Go to the Google Play Store and download the Google Text-to-Speech app: https://play.google.com/store/apps/details?id=com.google.android.tts
- After installing, if you go back to the Settings and find the Preferred engine option, it should now be selectable and Google Text-to-Speech should be an option.
- After selecting, you should see Google Text-to-Speech as the Preferred engine.
- Open up the app again and it should work now.
If any of these steps don't work, please try rebooting your tablet to see if that helps it recognize the new settings.