I was having an issue with localhost references in GNS3 due to IPv6 so I edited my .net file and replaced all localhost entries with 127.0.0.1, then I couldnt open the file. I changed some base port configurations and now it opens, but I get multiple errors relating to:
208-unable to find object 'R10'
and now
206-unable to create UDP NIO
I am also opening the file between two different PC's (Home and Work) could this be an issue too?