Hi,
I am working the Analyzing traffic accidents in space and time case study and trying to run the Create Space time tool.
This is the error message I get:

By curiosity, I followed the Traceback and I see all modules are there. Am I missing something?

My sys specs:
ArcGIS Pro 2.0
Windows 7 6.1.7601 SP1
i5/4570 CPU@3.20GHz
python 2.7.5 default
python 2.7.13 and 3.6.1 installed in conda/envs