Error Running Keras Extensions

Colleagues:

I installed the Keras Extensions (and required Python libraries) on a Dev box in my shop (through an environment crerated in Anaconds) following the very helpful instructions from Jesus - was even able to install Graphviz and Pydot.  As per the instructions, I tested the install within Preferences, and everything checked out great - no issues (see screeen shot "Keras_OK.png".

When I tried to run some of the sample Keas processes, I get a NullPointerException error message and the process aborts (see screen shot "Keras Issue.png").

I idid masnage to install the Keras extension on a different machine in my shop (also within an enviroment within Anaconda) - and am able to run the samples.  

Thanks for any guidance on troubleshooting the error message, and best wishes,

Michael