Set error if there are error downloading audio or video

app.py

@@ -503,11 +503,9 @@ def get_audio_and_video_from_video(url):
     video = "videos/download_video.mp4"
 
     if not os.path.exists(audio):
-        return (
-            gr.Textbox(value="Error downloading audio"),
-            gr.Textbox(value=""),
-            gr.Textbox(value=""),
-        )
+        raise Exception("Error downloading audio")
+    if not os.path.exists(video):
+        raise Exception("Error downloading video")
 
     return (
         gr.Textbox(value="Ok"),