Cheats Not Working At All

are you loaded into a lot when you put in testingcheats true? only asking because it doesn't work and throws up that error if you're not.

also when you say you can't give yourself money, did you load into a household to do that or click straight into build mode from the world screen? I found that cheat doesn't work (does nothing) if you go straight into build mode from the world screen, maybe that's what's wrong?