Update app.py

app.py

@@ -847,7 +847,11 @@ if st.session_state["generated_questions"]:
                     mode=WebRtcMode.SENDONLY,
                     audio_receiver_size=256,
                     media_stream_constraints={"audio": True, "video": False},
-                    rtc_configuration = [{"iceServers": {"urls": ["stun:stun.l.google.com:19302"] }],
+                    rtc_configuration = {
+                        "iceServers": [
+                            {"urls": ["stun:stun.l.google.com:19302"] }
+                        ]
+                    }
                 )
 
                 if webrtc_ctx.state.playing: