Cannot create Google Account: There was an error while trying to process the request: userActionFinished error: 2
As reported at KDE and Launchpad, signon-ui is crashing when attempting to add a Google account to Online Accounts in KDE (in my case, Kubuntu 17.04 w/ latest updates).
It was working until recently (a couple of weeks ago) but now gives the aforementioned error dialog: "There was an error while trying to process the request: userActionFinished error: 2".