title: Anylogic: Lift trucks get stuck before a node
body: <p>after a long time. I am building a simple model of lift trucks moving some parts. when they reach a specific node as a destination node of a rackStore pick module, they are stuck and do not move any more. I don't know whether the problem roots in my flowchart and the properties of each item of my flowchart or it is because of my network? I think the former is much more probable.</p>
  <p><a href="https://i.stack.imgur.com/R4R9T.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/R4R9T.png" alt="my flowchart" /></a>
  my flowchart</p>
  <p><a href="https://i.stack.imgur.com/UXiGC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UXiGC.png" alt="1 is rack store where lift trucks starts from, 2 is destination node and star is where lift trucks stop and do not move any more" /></a>
  1 is rack store where lift trucks starts from, 2 is destination node and star is where lift trucks stop and do not move any more</p>
  <p><a href="https://i.stack.imgur.com/iaZyW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iaZyW.png" alt="arrows show problem location in flowchart and in 3d view" /></a>
  arrows show problem location in flowchart and in 3d view</p>
  <p>finally the error is this:
  root.rackPick.moveToDest:
  An agent was not able to leave the port root.rackPick.moveToDest.out at time 13.698 / date Jan 17, 2021, 12:13:41 AM (current model time is 18.098).
  Consider increasing capacities and/or throughputs of the subsequent object(s) or using PULL protocol</p>
  <p>I know that it may be very simple error, but I have been away from anyLogic for a long time and need your help even in simple problems. thanks in advance.</p>