Sims 4 - Failed to Save

itskingrandy​  Please test without MCCC, just to be thorough.  You can set aside a copy of your save now if you don't want to overwrite it with MCCC removed, although the mod should be removable in general.

Please also let me know whether this happens to a new save, and whether it happens with your computer offline.  You can sign into the EA App and put it in offline mode, then disable wifi and/or disconnect the ethernet cable before pressing Play.  Neither of these is a fix, just a kind of diagnostic test.

Thank you for the tip, also I kinda realized I have had MC command center since February 9th and haven’t updated it since by downloading the latest one that works with the latest patches, would that be the main cause of it not working? Because it’s strange that the overall functions of it were still working even though it wasn’t up to date, and the failed to save error randomly came up tonight too.

itskingrandy​  The last major patch was February 3, with the subsequent patches addressing only a few issues, so it's possible MCCC is still fully compatible with the game.  It's also possible it's mostly compatible but that there are some minor issues that only show up in certain circumstances.  I don't keep up with mod-related updates in general, so I couldn't tell you.  But even a fully-updated mod isn't necessarily going to work perfectly, and therefore there's no substitute for testing.

I may have identified the issue, the game would save fine only if the Last Exception was not caught by MCCC in the orange notification box, although every time my game said the Last Exception was caught by MCCC, the saving would fail. And when I made a completely new save file, this error didn’t appear at all and saving is working fine again. Would this appear to be because my original save file got corrupted somehow, and my question is how did it get corrupted in the first place, and how can I avoid it from happening again in the future?

Well, update.. on the new save file, the same notification does still appear saying MCCC caught The Last Exception but saving still is fine, does this further prove it was a corrupted save overall? Because the notification of it being caught always showed up whenever I played and it was never an issue up until recently..

itskingrandy​  Can you save with MCCC removed?

You can also try recovering a backup copy of the broken save:

https://sims4.crinrict.com/eng/2014/09/recover-backup-save-game/