the save is out of snyc
for ref 304 and 116 = the server thinks you are already logged in and so rejected your sign in... given the sorry state of Larian servers these last two days its hardly a shock
1 wait 15 mins before trying again... thats Steams timeout limit
2 you can try a local save... you rally only want cloud saves for swapping between other computers imo but hard save point also tend to be more stable than quick save and auto save is the worse option
if it works how you are saying, why can i load a save from about an hour or so before but ocne i play on that one when i try to save later on it goes back to this error.
i did it twice or so going back saves and tyring to play ending up just losing a few hours