[Tts] Raise exception for screen reader off error from native library (#4973)

Signed-off-by: Suyeon Hwang <stom.hwang@samsung.com>

diff --git a/src/Tizen.Uix.Tts/Tizen.Uix.Tts/ExceptionFactory.cs b/src/Tizen.Uix.Tts/Tizen.Uix.Tts/ExceptionFactory.cs
index a471f7d..aebf860 100755 (executable)
--- a/src/Tizen.Uix.Tts/Tizen.Uix.Tts/ExceptionFactory.cs
+++ b/src/Tizen.Uix.Tts/Tizen.Uix.Tts/ExceptionFactory.cs
@@ -112,6 +112,12 @@ namespace Tizen.Uix.Tts
                         break;
                     }
 
+                case TtsError.ScreenReaderOff:
+                    {
+                        exp = new InvalidOperationException("Screen reader off");
+                        break;
+                    }
+
                 default:
                     {
                         exp = new Exception("");