on the server of Speech recognition service
■ When you activate Qvoice (Voice Mate) using voice activation, an error is occurring on the server of Speech recognition service.
This symptom is observed after updating Google app to 4.1.24 version.
How to fix
■ Update the latest version (v4.1.29 or higher) of Google app which fixes an issue with Qvoice (Voice Mate).
Google app update has been available since 5th Feb 2015 through Google Play Store.