Re: 'The game failed to save. Error code: 0' appeared when I tried to save the game?

@TokiyoGun

Well, I do not think it should be caused by cheats. Yes save games can become corrupt, but it is not very usual.

Mods/cc could be a reason though. If this happens often enough, I would try removing all of them to see if the game works better.
For example, move the mods folder from C:\Users\Username\Documents\Electronic Arts\The Sims 4 to your Desktop and start the game.

The only 100% sure way to know if it is a mod problem, is removing the mods, starting a new save to make sure nothing is corrupt, and test the game. With a problem like yours that is very time consuming, but it's the only "fireproof" way.

You should also delete the localtumbnail.package from C:\Users\Username\Documents\Electronic Arts\The Sims 4\