Yes gcoin.conf in the roaming folder (GCoin in roaming)
all you need to do is rename your file to GCoin.conf - it's case-sensitive

So I did the GCoin.conf is you can see in the pic in the roaming folder (case sensitive) if the file is empty no error if I put this in the file:
addnode 223.62.216.91:56588 add
addnode 223.62.216.91:39315 add
addnode 223.62.216.91:56577 add
addnode 223.62.216.91:39304 add
addnode 129.144.152.4:65477 add
addnode 62.10.160.126:53579 add
I get that error I put the picture.
By the way if I was paying the developer to make this I wold tell him to have the message in text so normal people could copy/paste nothave to take screen shots then upload to tiny pic so i can post the error here but who cares about what a techstupid thinks.
So what next?