Unable to connect to the target

Trying to connect to the opta PLC. Have both the Arduino PLC IDE and the Arduino PLC IDE tools installed on the PC.
Select the port and download ok,
Get as far as "connects to the target"
on the bottom right of screen it goes from not connected to Error,
Any ideas on how to progress
Thanks in advance

Hi this guy goes through the process and also talks a little about why you get that error. I hoe this helps
https://www.youtube.com/watch?v=BI6SA6TvQV0&t=251s

I tried this. It did not work.

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