November 2017 - last edited November 2017
The numbers behind the 102: are important and there's still a few floating around. I will list them here and what to do. There's a thread for each. Please post in the appropriate one.
This issue was fixed in a patch today. Please backup your saves and patch your game. All your old saves should be back to working order.
SimGuruNick just tweeted about this issue
On loading a certain save, I get either error 102 (live mode) or error 122 (build mode)
The cause is unclear at this point but it seems to have something to do with broken relationships and deleting Sims.
At this point, there is none. You can try recover a new save via the recover save game function but it might break again.
The best thing to do is save your broken save game to a safe place like an external drive and not play with it until this can be fixed. Backup your entire saves folder found here: documents\electronicarts\thesims4\
Start a new save and do not re-use any Sims from your gallery unless you haven't played with them. This is only temporary until EA/Maxis can fix this issue.
Before starting a new save, close down the game completely and re-start it.
What info to provide
In order to help the devs fix this issue, it would be great if you could share some info.
You can post in this thread: Error 102/122 and please include a picture of the error message. The whole number is important and it's tedious to type the it, so screenshot is the easiest way.
Please also share your saves with QA. You can find instructions how to do so in this link: [INFORMATION] How to Send User Files to The Sims 4 Team. There will most probably be no feedback but every save shared can help narrowing down the issue and fix it.
Any additional info you can give is interesting:
I don't work or have any association with EA. I give advice to the best of my knowledge and cannot be held responsible for any damage done to your computer/game.
Please only contact me via PM when asked to do so.