add error handler for API request

chat.py

@@ -1,12 +1,13 @@
+from openai.error import AuthenticationError
 from pathlib import Path
 from gtts import gTTS, lang
 from io import BytesIO
 
+from src.utils.helpers import get_dict_key
+
 import streamlit as st
 import openai
 
-from src.utils.helpers import get_dict_key
-
 # --- PATH SETTINGS ---
 current_dir = Path(__file__).parent if "__file__" in locals() else Path.cwd()
 css_file = current_dir / "src/styles/.css"
@@ -34,6 +35,7 @@ user_text = st.text_area(label="Start your conversation with AI:")
 
 if api_key and user_text:
     openai.api_key = api_key
+    try:
         completion = openai.ChatCompletion.create(
             model="gpt-3.5-turbo",
             messages=[
@@ -79,3 +81,5 @@ if api_key and user_text:
                 tts.write_to_fp(sound_file)
                 st.write("Push play to hear sound of AI:")
                 st.audio(sound_file)
+    except AuthenticationError as err:
+        st.error(err)