Update changing.py
diff --git a/manimlib/mobject/changing.py b/manimlib/mobject/changing.py
index 0f10f5e3a0..69e9302ba3 100644
--- a/manimlib/mobject/changing.py
+++ b/manimlib/mobject/changing.py
@@ -92,7 +92,7 @@ def update_path(self):
             self.get_points()[-1] = new_point
 
             # Second to last point
-            nppcc = self.n_points_per_cubic_curve
+            nppcc = self.n_points_per_curve
             dist = get_norm(new_point - self.get_points()[-nppcc])
             if dist >= self.min_distance_to_new_point:
                 self.add_line_to(new_point)

To fix the error of "AttributeError: 'TracedPath' object has no attribute 'n_points_per_cubic_curve'" (because in the CONFIG dictionary of VMobject class, the n_points_per_cubic_curve dose not exist, and now 'n_points_per_curve' is used instead)