Denoising Diffusion Implicit Models Example Does not run

[Peter Majewicz]

This example does not run to completion.  I've tried the Colab link running tf2.18 and a mac running tf2.19.  Both complain about saving an unbuilt model.  Can anyone think of a quick fix?
https://keras.io/examples/generative/ddim/

[Peter Majewicz]

This between the compile and fit solves the error.

model.build(input_shape=[(None, image_size, image_size, 3), (None, 1, 1, 1)])