We're sorry you're experiencing these problems. This is normally because the Speech Services by Google app (formerly called Google Text-to-Speech Engine) is not installed on your device and is not selected as the preferred Text-to-Speech engine.
Here is how you can resolve this:
- Go to the Google Play Store and download the Speech Services by Google app: https://play.google.com/store/apps/details?id=com.google.android.tts
- After installing, if you go back to the Settings app and find the Preferred engine option for Text-to-Speech, it should now be selectable and Speech Services by Google should be an option.
- After selecting, you should see Speech Services by Google 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.