PLC error

I'm unable to simulate and download on software again ,popping up this message, a connection between your PC/programming device and PLC can not be establish

 

PLC error

I'm unable to simulate and download on software again ,popping up this message, a connection between your PC/programming device and PLC can not be establish

You need to tell us OEM Manufacturer of the PLC
Then we can support...

And a Hello/Hi/Good day would be much appreciated.
We are human beings before.. And good relationships start by good presentation/Salutations..