Learn to create Python3 plugins

[z-uo]

To transform the layer to a tensor or numpy or any other standard python information I decide to store it as PNG and after some computation I will load it, but the load functions seams not towork:

Code:

save_image(image, drawable, os.path.join(base_dir, "cache.png"))
img = load_image(os.path.join(base_dir, "cache.png"))
layer = Gimp.Layer.new(
                        img, 'loaded',
                        drawable.get_width(), drawable.get_height(),
                        Gimp.ImageType.RGBA_IMAGE, 100.0,
                        Gimp.LayerMode.NORMAL
 )
 position = Gimp.get_pdb().run_procedure('gimp-image-get-item-position',
                                 [image,
                                  drawable]).index(1)
image.insert_layer(layer,None,position)

It gets a gimp error that says that I try to add a layer to an incorrect image (it seems because img is different from image). I attached the full example code.
How do I load a png as a layer correctly?