ergonomic simulation

I have created the ergonomic simulation and had created get and put tasks for a part and after creating the tasks when i tried to simulate the human behavior I could not see the simulation the same is depicted for clarity in the ergonomic simulation-1 video attached to this post. But when I simulated only the put task the manikin was walking to the other location and then the part was flying to the manikin hand to place it on the table rather than manikin grasping the part and moving to the other location you could see it in the ergonomic simulation-2 video attached. could you explain why this is happening and how to resolve it and why when the human behavior is simulated the simulation does not run. 





DELMIA  Ergonomic Simulation Edu