I have built a very simple model, shown below:

model image

When the second train (left) touches the switch, an exception occur:

Cannot invoke “com.anylogic.engine.markup.RailwayTrack.getRailYard()” because “” is null.

I have no idea what’s causing this. The complete error message is:

complete erro message

I am using the Personal Learning Edition.

By the extreme simplicity, my expectation is the model to run properly. I just want to test the limits of the .reserveFor() method.

Both trainMoveTo have the code “track.reserveFor(train);” on the field “on enter track” and “track.cancelReservation();” on the field “on exit track”. Nothing more.