@User you need to start gaw from the xschem 'Waves' button, at the top-right of the window. Also ensure in your home directory there is a ~/.gaw/gawrc with this line:

up_listenPort = 2020

Also ensure in your ~/.xschem/xschemrc this line is set:

set gaw_tcp_address {localhost 2020}

Thanks for your input. I have verified the changes you suggested. But still I'm getting those errors. I'm sending some snapshots for better reference. Please help!

Did you try this video in the manual? https://xschem.sourceforge.io/stefan/xschem_man/video_tutorials/probe_to_gaw.mp4

Yes, I followed the steps but it's not working. The error snapshots are for reference with the same.

It looks that when you press the 'Waves' button gaw starts with the raw file loaded, right? If you select a net in the list and drag to one of the panels do you see waveforms?

Thanks for your support, I followed the steps you said. Even After that I'm getting this error again.

Install netcat (the nc command, may be it's already installed. Then run gaw from command line from a terminal window. Then in another window issue this command: nc localhost 2020 in the other terminal window you should read: Connected: localhost 127.0.0.1 If this does not happen there is some problem on the system, may be a firewall rule preventing local connections.

Yes I can got the Connected: localhost 127.0.0.1