How to resolve Control Expert Simulator Error "Can't start communication server TCP/IP Port 502 already in use"

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The PLC simulator run on Port 502. One possible cause is that the port 502 is already in use by another equipment/application.

The quickest way to see which application/program used Port 502, type Resource Monitor in search, If some other application used this port 502 then stop/ end task or disable the service or uninstall that application.