Sims 4 won't save!

My Sims 4 game won't save anything, unless something is being saved to my gallery. I looked at the saves file under the Electronic Arts folder and it did seem to be kind of full. But unfortunately it isn't very clear about what things are so it's not like I can just delete what I don't need and keep what I do need. I tried moving the things into a different folder (with an additional copy of it) to see what would happen. And it basically took away all of my data except for everything that I have in the gallery - which is a loss of hours and hours of work if I were to keep it that way. I don't want to have to loose the things that I have and want to keep now - things that I have worked hard at making. When I try to save it pops up an error code. I don't know what to do. Any advice?