Error connecting to graphical console: could not get a reference to type class

[irobayna]

I got two computers with this awesome package installed, on one I did a brew update & brew upgrade and when I connect to the VMs and try to view the console, I get this error. On the other computer which has not been updated, the console works as expected.

[ne4u]

this fixed it for me:
brew uninstall --force gtk+3 libvirt-glib gtk-vnc spice-gtk libvirt pygobject3 virt-manager virt-viewer && brew install virt-manager virt-viewer

[jeffreywildman]

Thanks for the note @ne4u. I'll add a note in the FAQ on the mainpage.

[Swivelgames]

As silly and off-topic as this may seem, I was chasing my tail for a good week until I figured out why this wasn't working for me. After uninstalling/installing virt-manager and virt-viewer again (so that I could use remote-viewer), I found that the reason I was getting my Socket I/O Timeout error was not related to virt-manager or virt-viewer at all.

I'm able to connect just fine on a different machine, but not on this one (oddly). In my particular instance, I use this crucial tool because it enables me to have near-zero latency (SPICE; as opposed to slower VNC) so that I can daily-use a Desktop VM hosted on my Proxmox hypervisor remotely.

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My specific problem (yours may be totally different) turned out to be an issue with one of my package versions. Because I installed/updated to the latest and greatest version of virt-manager and virt-viewer, I then needed to update my packages on the server that was hosting my SPICE service.

In particular, specifically on Proxmox, this turned out to be the libpve-http-server-perl package, which simply needed to be updated to latest (in this case 2.0-10). Voilà! Connection worked perfectly.

Hope this helps someone; even if you're not using Promox: make sure that the packages on the other end are up to date!