I am having the same problem with oVirt 4.2.7.1  .  Same error when clicking on Unattached under Hosts for a new Network:
"Uncaught exception occurred. Please try reloading the page. Details: (TypeError) : Cannot read property 'N' of null
Please have your administrator check the UI logs"
Is there a solution or work around?  I have a 3 node HCI on gluster up and running with 2 x 10G NICs on each Host.  Want to split of the gluster/storage traffic as recommended in you documentation:
https://www.ovirt.org/blog/2018/02/up-and-running-with-ovirt-4-2-and-gluster-storage.html
Thanks for any help.
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