I don't think this is it. When another AI defies the vote still takes place, the resolution fails, and the defiant nation receives -5
There will be a good reason for this message, but you'll have to post a before and after save I think.
An example of this (rare) occurrence: as AP resident, I'm at war with China and winning. I am then offered the chance to propose the motion: "Declare war on the infidels! (China)" Like a boss, I propose this motion and vote "yes." All my buddies hate China, and I have a good number of cities. In the same turn, I make peace with China for some free techs. "HAHA," I think, "we shall be at war in the next turn, and now I have Nationalism and Guilds!! MUHAHAHAHA."
Only the world saw through my cunning ruse. The election was cancelled