fix error

app.py

@@ -15,17 +15,31 @@ speaker_ids = model.hps.data.spk2id
 
 
 def inference(
-        text: str, speed: float, speaker: str, progress=gr.Progress(track_tqdm=True)
+    text: str, speed: float, speaker: str, progress=gr.Progress(track_tqdm=True)
 ):
-    out_path = "audio.wav"
-    model.tts_to_file(text, speaker_ids[speaker], out_path, speed=speed, format='wav')
+    try:
+        out_path = "audio.wav"
+        model.tts_to_file(
+            text,
+            speaker_ids[speaker],
+            out_path,
+            speed=speed,
+            format="wav",
+        )
+    except Exception as e:
+        return gr.Error(str(e))
     return out_path
 
 
 if __name__ == "__main__":
     theme = gr.themes.Soft(
-        primary_hue=gr.themes.colors.emerald,
-        secondary_hue=gr.themes.colors.emerald
+        primary_hue=gr.themes.colors.emerald, secondary_hue=gr.themes.colors.emerald
+    )
+
+    sample_text = (
+        "Hello, my name is Chi-ku-wa-bu. "
+        "I am a text-to-speech system designed to assist you. "
+        "How can I help you today?"
     )
 
     demo = gr.Interface(
@@ -33,7 +47,7 @@ if __name__ == "__main__":
         description="Convert English text to speech",
         fn=inference,
         inputs=[
-            gr.Textbox(label="Text to Synthesize"),
+            gr.Textbox(label="Text to Synthesize", value=sample_text),
             gr.Slider(minimum=0.5, maximum=3.0, value=1.0, label="Speed"),
             gr.Dropdown(
                 label="Speaker",
@@ -41,17 +55,15 @@ if __name__ == "__main__":
                 value="EN-US",
             ),
         ],
-        outputs=[gr.Audio()],
+        outputs=[gr.Audio(value="audio.wav")],
         examples=[
             [
-                "Hello, my name is Chi-ku-wa-bu. "
-                "I am a text-to-speech system designed to assist you. "
-                "How can I help you today?",
+                sample_text,
                 1.0,
                 "EN-US",
             ],
         ],
         cache_examples=False,
-        theme=theme
+        theme=theme,
     )
     demo.queue().launch()