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One possible cause is that the port 502 is already in use by another equipment.
The PLC simulator is TCP/IP server on the Schneider port 502.
The quickest way to see which ports are used is to open a DOS windows and to run netstat -a then you will see if port 502 is used or not.
To have more information on the equipment which use the port you can use a freeware like “CurrPorts” Copyright © 2004-2011 Nirsofer, downloadable from http://www.nirsoft.net.
So If another equipment is using this port 502 you will have to configure the equipment using this port to an other port to keep it free for Unity Pro. Unity Pro simulator can not use an other port.