I am getting a null pointer exception when trying to run gridlock in Windows 10 with Eclipse.


This is the error message


reading roads layer...
reading tracts layer...
creating network...
ERROR: issue with population file: java.lang.NullPointerException


I am new to GIS issues so I'm not sure what I need to do to resolve the issue.


The model appears to be running in mason, but I'm not seeing any of the agents moving around the road network