What Linux distribution are you using? The traceback appears to be complaining about a call to /bin/ip, which should be present on any Linux distribution. I've only run the program on Ubuntu, where I know that it works.
You could make the traceback go away by disabling "Load Keys on Startup" and "Save/Restore Tunnel State". You will have to click the "Load Keys" button if your keys aren't already loaded in your ssh-agent, but then, it appears from the output that you don't have an ssh-agent running either. The "Load Keys on Startup" functionality expects you to be able to run ssh-add.
If the above doesn't help to work around the problem, then maybe it's an issue with the icon set you're using. Please let attach a listing of all the icons in the icon set. The program assumes that all of the standard ones will be present.
What Linux distribution are you using? The traceback appears to be complaining about a call to /bin/ip, which should be present on any Linux distribution. I've only run the program on Ubuntu, where I know that it works.
You could make the traceback go away by disabling "Load Keys on Startup" and "Save/Restore Tunnel State". You will have to click the "Load Keys" button if your keys aren't already loaded in your ssh-agent, but then, it appears from the output that you don't have an ssh-agent running either. The "Load Keys on Startup" functionality expects you to be able to run ssh-add.
If the above doesn't help to work around the problem, then maybe it's an issue with the icon set you're using. Please let attach a listing of all the icons in the icon set. The program assumes that all of the standard ones will be present.