Update app.py

app.py

@@ -63,7 +63,8 @@ def infer_headswap(source, target):
                 full_frames, pad_top, pad_bottom, pad_left, pad_right, cv2.BORDER_CONSTANT, value=0)
             dets = app.get(full_frames)
             if len(dets) == 0:
-                raise gr.Error(f"no head on {'target' if target else 'source'} image", duration=-1)
+                gr.Warning(f"no head on {'target' if target else 'source'} image")
+                raise gr.Error()
         kps = dets[0]['kps']
         wide = wide_crop_face(full_frames, kps, return_M=target)
         if target: