How to save optimiser state and the model of CGAN?

Specific Domains Machine Learning
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1

link : https://github.com/FluxML/model-zoo/blob/master/vision/cdcgan_mnist/cGAN_mnist.jl

i tried inside training loop:

@save "gen-model-$(now()).bson" gen opt_gen
@save "dscr-model-$(now()).bson" dscr opt_dscr
ERROR: LoadError: SystemError: opening file "genmodel-2021-08-28T17:18:44.080.bson": Invalid argument