📓[GUIDE] Loading/Saving Error Codes and LastExceptions
Error Codes and LastExceptions point to something going bad in your save game. This article gives a little overview of what these are and what you can do.
There are two different kinds of error codes in Sims 4: Save Errors and Loading Errors.
The save errors won't let you save your game while loading errors occur when trying to load into a lot. Both of these errors also throw LastExceptions.
This article will give you some pointers as to what you can do to troubleshoot them or how to get the best help.
With all of this it's important to test without mods/cc. Best is to try a clean folder with just your save game put back.
Also check the compiled bug list for known errors.
Save Errors
Save errors only pop up in live/build mode. If you save on the map you won't get an error code. Most often the game still won't save on the map though, you just won't realize it hasn't.
Save Errors can be anything from a couple of digits (e.g. Error code 22) to a long string.
Causes include corrupt save games, outdated mods/cc and bugs.
If you run across any, it's best to create your own thread in The Sims 4 Gameplay Questions & Issues and provide as much info as possible for troubleshooting help. Before posting, make sure you test without mods/cc. Provide any LastException files you might get.
Load Errors
Load Errors occur when you try to load a certain lot in either build or live mode. Typically you are thrown back to the map when a load error occurs.
Load Errors typically have three parts: <three digits>:<eight digits>:<more digits>.
In most cases only the first two parts are important, in some cases only the first part. I've yet to see a case where the third part was of any importance. You'll find some explanations of the most common ones below.
Load Errors have a wide range of causes and I don't want to get into them in too great details here. You can find some troubleshooting information here: Loading a family just reloads the map.
If none of these tips help you, it's best to create your own thread in The Sims 4 Gameplay Questions & Issues and provide as much info as possible for troubleshooting help. Before posting, make sure you test without mods/cc. Provide any LastException files you might get.
Known Load Errors
For current specific codes, please check the compiled list. This part explains what common numbers mean and where you can start troubleshooting
| Error Code | Related to | Second Part important | Mod Related | Where to report |
| 102 | Load Household/Sim | Yes | High Chances | Gameplay if tested vanilla |
| 122 | Load Lot in build mode | Yes | High Chances | Gameplay if tested vanilla |
| 109 | Loading lots with situations going on (Events and such) | Yes | Low Chances | Bug Forum if tested vanilla |
| 110 | Wide variety of causes | Yes/No. Often different number for same error | High Chances | Gameplay if tested vanilla |
| 111 | Caused by faulty objects such as plates of custom food removed from game | No | Removed CC, will occur on vanilla | Load lot in build mode, delete empty plates. Gameplay if you still have issues |
| 123 | Loading lots of a specific lot type that has an issue | Yes | Low Chances | Bug Forum if tested vanilla |
| 132 | Corrupt Pools/Ladders or other 'portals' | No | Low Chances | Bug Forum if tested vanilla |
| 135 | - | No | Very High chances | Gameplay if tested vanilla |
| 800/801 | Lot Corruption | n/a | Low Chances | Load Error Code 800/801 |
LastExceptions/LastUIExceptions
LastExceptions and LastUIExceptions typically get written if an error occurs that the game doesn't know how to handle. In a vanilla game, you won't realize that they occur unless there's also a visual problem in the game (resets, distorted UI, ..).
Mods like Better Exceptions and MC Command Center display these within the game so you always know when something happens. The errors are game errors though and you'll also get them without these mods installed unless one of them is the cause in the first place. The file gets written to your user folder so you can find them in Documents > Electronic Arts > The Sims 4.
A lot of these are actually harmless but they can be an indication of something bad going on in your game.
If you have any issues, a LastException is always the first place to look as it can give you an indication of where to start. You can open the file with any text editor and read it. They aren't easy to understand but look for mod names in there that can point you to possible outdated mods. There are also Discord servers out there that can help you decipher them.
If you need help with LastExceptions for unmodded games, make sure to post them in the forums. You can't upload them though, you need to copy/paste the content or upload them to OneDrive or Google Drive (make sure it's public) and provide the link in your forum post.
