change mp3 file ab mode to wb mode

app.py

@@ -224,7 +224,7 @@ def get_a_talk(id, api_key = os.environ.get('DID_API_KEY')):
 
 def get_mp4_video(input, avatar_url=avatar_url):
     response = generate_talk_with_audio(input=input, avatar_url=avatar_url)
-    print("DID response: "+response)
+    print("DID response: "+str(response))
     talk = get_a_talk(response['id'])
     video_url = ""
     index = 0