The game failed to save. Error code: 510:78f70847:44708b40

Hi @Simmie555

are you using any mods/cc in your game ?

@Sfe32ygz3

Try to remove them and 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.

If that works but you want to keep your mods, you can try some different things to sort out the ones not working:

• If your problem occurred after a certain mod haul, remove all these new mods (see if the game works), and then add back a few at a time, restarting the game in between until you see the problem occurring again. Remember that you can possible have several broken mods.
• If the problem started after the latest patch/update, always make sure to update your mods when you update your game. Check this list out for some mods that were broken in the C&D-patch! A few others have been broken after but not so many that there is a list.
  http://forums.thesims.com/en_US/discussion/928106/broken-mods-cats-and-dogs-nov-2017
• Download Sims 4 Studio and do batch-fixes for your cc.
• Search for the Mod Conflict Detector on google and run it, see if it can detect some broken/conflicting mods, remove these and try your game again. (Only detects conflicts between mods, not between mods and the game)
• Like the first "solution", but for all your mods. Remove all and put back some at a time to find broken ones (last resort if you have like 1000 mods).

Good Luck!

@CMeki

Thanks for your help,

I've put all my mods folder on my desktop and launched the sims, everything was okay with the game, so I put one by one the mods folder back into the sims 4 folder and I figured out which mod was breaking the game

@Sfe32ygz3

Great that you got it to work! 🙂

@Mr_Panda_lol

Did you move the whole folder and it still did not work?

Try resetting your files to factory settings.

• Make a backup; copy your The Sims 4-folder from C:\Users\Username\Documents\Electronic Arts to an external drive or somewhere else on your computer, for example your desktop.
• Rename the The Sims 4-folder in C:\Users\Username\Documents\Electronic Arts to The Sims 4_backup
• Start the game, make a new save, and see if the error is gone. 
  (The game will have created a new The Sims 4-folder in your documents, this is supposed to happen)
  
  
  • If yes, continue
  • If no, post a reply telling us the error is still there
• Start putting folders back in the new The Sims 4-folder. Observe! After every file/folder, start the game and make sure it still works, before putting in the next one.
  • Options.ini - your game settings
  • Saves - your old saves. The sub-folders are not needed. If putting these back causes problem, try putting one back at a time.
  • Screenshots
  • Custom music - if you have any
  • Tray - your library objects; like lots, rooms and sims
  • Mods - your mods and cc, might cause problems when putting back

If putting back one of the folders was problematic and you did not work it out, please post a reply and we'll see if we can find what your problem is!

Source: https://help.ea.com/en-us/help/the-sims/the-sims-4/backing-up-and-resetting-the-sims-4/

Good Luck! 🙂

Then look for updates to those that no longer works.