Error(s) in loading state_dict for DataParallel in generating_samples.py

After a whole training with

$ python3 sourcecode/train.py --depth=7 --latent_size=256 --images_dir=DATASET --sample_dir=sampledir/exp2 --model_dir=modeldir/exp2

when launching

$ python3 sourcecode/generate_samples.py --generator_file=modeldir/exp2/GAN_GEN_100.pth --depth=7 --out_dir=outputdir

I got:

''
Creating generator object ...
Loading the generator weights from: modeldir/exp2/GAN_GEN_100.pth
Traceback (most recent call last):
File "sourcecode/generate_samples.py", line 134, in
main(parse_arguments())
File "sourcecode/generate_samples.py", line 105, in main
gen.load_state_dict(
File "~/.local/lib/python3.8/site-packages/torch/nn/modules/module.py", line 1051, in load_state_dict
raise RuntimeError('Error(s) in loading state_dict for {}:\n\t{}'.format(
RuntimeError: Error(s) in loading state_dict for DataParallel:
Missing key(s) in state_dict: "module.layers.7.conv_1.weight", "module.layers.7.conv_1.bias", "module.layers.7.conv_2.weight", "module.layers.7.conv_2.bias", "module.layers.8.conv_1.weight", "module.layers.8.conv_1.bias", "module.layers.8.conv_2.weight", "module.layers.8.conv_2.bias", "module.rgb_converters.7.weight", "module.rgb_converters.7.bias", "module.rgb_converters.8.weight", "module.rgb_converters.8.bias".
''

Both training and generation are executed on the same machine with multiple GPUs enabled and ready.