I followed the instructions provided on https://docs.flexsim.com/en/19.1/Tutorials/FlexSimHC/1-1UseActivitySet/1-1UseActivitySet.html and I get the following error
FlexScript exception: cannot access up property on non-treenode Variant at MODEL:/Tools/People/Flows/Activities/Wait In Line/Already In Line?>variables/decision
I have reviewed the logic several times and the system stops after creating the first entity. Could you please give me some pointers