Thank you but this fix not work for meI came on here because my Ethernet interface stopped working after this update, so another network bug. However, I just fixed my issue by going to /Library/Preferences/SystemConfiguration/ and deleted "preferences.plist" (after making a backup on my desktop). This caused the Network Pane to come up blank and crash if I tried to add any interfaces/services, but when I created a "Location" using the menu at the top middle, my pane reloaded with all my previous settings missing (VPN configurations) but everything functional and a new "preferences.plist" in the afore mentioned folder.
I'm having the same problem since High Sierra Beta 5, and the only solution I've found so far is to copy the original Network.prefpane file from a clean installation to a backup folder, which I use to replace the file located under /System/Library/PreferencePanes whenever the error message is displayed. This allows me to open network settings again, but for some reason my NetBIOS settings under the WINS tab are never properly saved.Thank you but this fix not work for me