Getting Error in cadCAD Tutorials

Hello,
I recently started cadCAD tutorials. When I run Part 1, I am getting a type error as below.

cadCAD Version: 0.4.28
Execution Mode: single_proc
Simulation Dimensions:
Entire Simulation: (Models, Unique Timesteps, Params, Total Runs, Sub-States) = (0, 0, 0, 0, 0)
Traceback (most recent call last):

  • File “”, line 1, in *

  • run.execute()*

  • File "**/python3.7/site-packages/cadCAD/engine/init.py", line 149, in execute

  • self.exec_context, self.exec_method = auto_mode_switcher(config_amt)*

TypeError: cannot unpack non-iterable NoneType object

Is there a solution to rectify it?