I am running a simulation for a project I'm working on and I keep receiving this error. The error is caused when an operator is moving a group of parts from one queue to another following network nodes to get there. I have double checked that everything is programmed the same as other objects that have ran through this process flow successfully, so I'm not sure why there is an error for this part. Unfortunately I can't post the model, but I can debug it myself if given some direction. What does this error mean and what typically causes it?