December 2018 - last edited February 2019 by crinrict
I just developed this 510 error as well. Followed all of the instructions re: removing mod folder, clearing cache, repairing game, etc. It was giving the error when I had the game create a brand new Sims 4 folder and then only moved the one save file with no mods or cc. After two days I narrowed it down to the Branding that was supposedly fixed. I closed down my brand and was able to save. I hope this works for someone else.
Solved! Go to Solution.