NameError: name 'shape' is not defined

[Tonyztj]

Traceback (most recent call last):
File "D:/github/DCGAN-LSGAN-WGAN-GP-DRAGAN-Tensorflow-2-master/DCGAN-LSGAN-WGAN-GP-DRAGAN-Tensorflow-2-master/train.py", line 91, in
G = module.ConvGenerator(input_shape=(1, 1, args.z_dim), output_channels=shape[-1], n_upsamplings=n_G_upsamplings, name='G_%s' % args.dataset)
NameError: name 'shape' is not defined
please tell me why