handle voice generation failure exception

utils/tts.py

@@ -164,13 +164,18 @@ class TTSEngine:
                 # Use Kokoro FastAPI server for TTS generation
                 logger.info("Generating speech using Kokoro FastAPI server")
                 logger.info(f"text to generate speech on is: {text}")
-                result = self.client.predict(
-                        text=text,
-                        voice_names=voice,
-                        speed=speed,
-                        api_name="/generate_speech_from_ui"
-                )
-                logger.info(f"Received audio from Kokoro FastAPI server: {result}")
+                try:
+                    result = self.client.predict(
+                            text=text,
+                            voice_names='af_nova',
+                            speed=speed,
+                            api_name="/generate_speech_from_ui"
+                    )
+                    logger.info(f"Received audio from Kokoro FastAPI server: {result}")
+                except Exception as e:
+                    logger.error(f"Failed to generate speech from Kokoro FastAPI server: {str(e)}")
+                    logger.error(f"Error type: {type(e).__name__}")
+                    logger.info("Falling back to dummy audio generation")
             elif self.engine_type == "dia":
                 # Use Dia for TTS generation
                 try: