ValueError: Variable d_wconv1/Adam_1/.... Tensorflow 1.2 needs tf.variable_scope()?

[nealmcb]

On line:

trainerD = tf.train.AdamOptimizer().minimize(d_loss, var_list=d_vars)

I get

ValueError: Variable d_wconv1/Adam_1/ does not exist, or was not created with tf.get_variable(). Did you mean to set reuse=None in VarScope?

This is using Tensorflow 1.2.0, on a Databricks Community Edition notebook.

This issue for another GAN implementation looks relevant, and some code updates for it are available: carpedm20/DCGAN-tensorflow#66