Baldur's Gate 3 Error 516

What Causes the Error? - Speaking to a trader who defaults to Trade mode instead of Barter mode. You will get Error 516 when you try to save. Switching that Trader to Barter mode and exiting the conversation WILL NOT fix it, they will still open back up to Trade mode.


Solution 1 - Barter with another Trader that does default to Barter mode. After you exit the conversation you can save again.


Solution 2 - Plug in a controller, and let the game switch to "controller mode" (you'll see the UI change completely). Then speak to any trader. Once in dialogue with them, you'll see an option in the bottom right to "Press Y to Trade". After you exit trade, you should be able to save again.


Example - For me, Quartermaster Tali was defaulting to Trade mode and broke my game. Dammon still defaulted to Barter and was able to fix it. It may not be the same traders for you though, I've seen other people say Dammon broke theirs.

This is ultimately an art not a science. Its plausible all your traders are defaulting to trade, if you don't have a controller for Solution 2, you might be screwed until an update fixes it though (although I didn't have this problem till update 3, so I think updates caused it in the first place).

Found this solution on steam community:
Creds:Baldur's Gate 3 :: Steam Community

Hopefully this works for you
 
Its possibly related to memory or space.

First thing to do is free up some hardisk/ssd space. If those are fine, delete some quick saves and the error should go away
 
Not sure if anyone suggested this already but speaking with the same trader that caused this issue and going into trade through the UI trade button at the bottom left of the screen will fix the issue. No controller is needed.