The error message is self explanatory. You have already enabled the maximum 4 NAPs.
Sorry, I don't quite understand. I'm very new to the whole voting and eco-lifestyle thing. What do you mean by I have already activated the maximum 4 NAPs? I couldn't click on anything including those 4 NAPs.
If you want another NAP than one of the 4 already in place you need to repeal one of those just like the message said. You start the repeal process from the NAP board or from your mailbox. It says something like "Start repeal process").
How did my neighborhood choose those 4 NAPs in the first place?
If you haven't disallowed NPC voting in the settings, there will be randomly voted NAPs, one added every week you play. It doesn't matter which neighbourhood you play in, they all get their NAPs.
