I just got this error code 13 after opening a daycare, and it was one I built entirely myself. I had just uploaded it to gallery servers, after testing it, and then attempted to save my game, and it gave me error code 13, and refused to save, I am currently in the process of debugging the game after load.
Edit: OK it looks like the save reverted to a state before I made the lot a daycare...Let me retrace my steps:
- I already had an existing small business which was named "Liz's Club", because it was a small business retail I redefined it's rules and purchased a new empty lot in Willow Creek that was step 1
- I proceeded to travel to the lot and edit it for usage as a daycare, that was step 2
- After editing it without uploading it to gallery I used it to play a workshift for testing. I played the remainder of the ingame day on that lot.
- Having been satisified that the build was viable, I decided to share it to gallery which was something I didn't know if it would work since it's not the 13th of Jan (Laundry List Patch Day) yet.
- Having SUCCESSFULLY uploaded the lot I proceeded to prepare to shutdown my game by making a hard save like I always do and received "Game Failed to Save: Error Code 13"
- I tried again atleast 2 times to save manually both returned the same error code.
- I finally gave up and save and quit even knowing the save wasn't made, and went on the internet to search error code 13 sims 4.
- Google came up with this forum post and I checked it and sure enough it's what happened to me.
- At the same time I was originally posting this I was reloading the game which was in the boot sequence in the background
- When I finished posting and returned to the game it was at a state before step 1, and I came back to post this update.
Also for the record, this is on PC not Playstation, and I have almost all the packs (including Enchanted By Nature, and Businesses and Hobbies, as well as Adventure Awaits.)
Also I can assure you no CC or Mods have ever touched this hard drive's install of the Sims 4, because the last time I used such was on a different PC, Under a different install, with a different save. I also haven't downloaded gallery content in ages.