unable to add reference to windows.media.speechsynthesis.dll

Question

I am working on text to speech conversion in windows 8.1 (silverlight) and i need to access the SynthesizeTextToStreamAsync method for which I need to add reference to Windows.media.speechSynthesis. I am unable to add this reference to my project

it shows me error message as

A reference to a higher version or incompatible assembly cannot be added to the project.

I am currently using Visual studio 2013 professional version. Can someone please help me out with this issue?

Answer 1

Look at MSDN, it is only supported in 8.1 XAML apps, not in 8.1 Silverlight apps.