Update app.py

app.py

@@ -109,7 +109,7 @@ def get_abstracted_symbols_calculated(video, progress=gr.Progress()):
 
 def get_abstracted_symbols(video, progress=gr.Progress()):
     if video is None:
-        raise gr.Error("input a video!!")
+        raise gr.Error("Click on an example diving video first!")
     key = get_key_from_videopath(video)
     if key is None:
         return get_abstracted_symbols_calculated(video, progress=progress)