Microcontroller simulation Problem.

[yalect]

Hi, I would like to ask you that I have problem with PIC microcontroller simulation in Multisim software, when I try to simulate a circuit it shows me that it's out of date then not working, time step runing and nothing is changing other compenents circuit simualtion works ( leds, transistors.....etc) but microcontroller no.

Have you an Idea?.