Update tts.py

add err handler

src/utils/tts.py

@@ -1,5 +1,5 @@
 from typing import Any, Dict, Optional
-from gtts import gTTS, lang
+from gtts import gTTS, gTTSError, lang
 from io import BytesIO
 
 import streamlit as st
@@ -39,7 +39,10 @@ def speech_speed_radio() -> bool:
 
 def show_player(ai_content: str, lang_code: str, is_speech_slow: bool) -> None:
     sound_file = BytesIO()
+    try:
         tts = gTTS(text=ai_content, lang=lang_code, slow=is_speech_slow)
         tts.write_to_fp(sound_file)
         st.write("To hear the voice of AI, press the play button.")
         st.audio(sound_file)
+    except gTTSError as err:
+        st.error(err)