Update app.py

app.py

@@ -530,7 +530,7 @@ class Drag:
 def reset_states(first_frame_path, last_frame_path, tracking_points):
     first_frame_path = gr.State()
     last_frame_path = gr.State()
-    tracking_points = gr.State([])
+    tracking_points = gr.State()
 
     return first_frame_path, last_frame_path, tracking_points
 
@@ -549,7 +549,7 @@ def preprocess_image(image):
     
     image_pil.save(first_frame_path)
 
-    return first_frame_path, first_frame_path, gr.State([])
+    return first_frame_path, first_frame_path, gr.State()
 
 
 def preprocess_image_end(image_end):
@@ -566,7 +566,7 @@ def preprocess_image_end(image_end):
 
     image_end_pil.save(last_frame_path)
 
-    return last_frame_path, last_frame_path, gr.State([])
+    return last_frame_path, last_frame_path, gr.State()
 
 
 def add_drag(tracking_points):