Add-on AttributeError

[kateumnova]

Hello,
Really looking forward to be able to import vertex animations in Spark. Blender 4.1 gives the following error.
What could cause it? Tried an earlier version of Blender and had the same error

Python: Traceback (most recent call last):
File "//Blender/4.1/scripts/addons/vertex_animation.py", line 367, in execute
meshes = get_per_frame_mesh_data(context, data, objects)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "//Library/Application Support/Blender/4.1/scripts/addons/vertex_animation.py", line 56, in get_per_frame_mesh_data
me.calc_normals_split()
^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'Mesh' object has no attribute 'calc_normals_split'