This happened before to me but I didn't wanted to report it hoping it might not be serious. But now it is starting to be a problem for me, because I can't save my work.
What happened: I changed my title screen and saved, it worked and then I tried changing 2 small pictures and save and it crashed I got message on the picture. I needed to reload backup files because it reports missing game.dat files and loaded levels are empty.
Now when I try saving after change of title screen or small picture it does it every time, crashes and reports that error missing game.dat file (without that other line now). After some time have got it to save game after title screen change but then later after small pictures change it continued to crash so I decided to report it, because I need to copy paste my backup version to make it work again.
Now I can upload to my site backuped version of my mod, that if small picture is changed and then design saved DC crashes. I don't know why it is happening probably there is something that activated this.
Editor file UafErr_Edit.txt just says that it is missing config.txt but it maybe happened before this crash event. Anyway I will upload my design with instructions what I tried that is causing this crash just to switch from my latptop to desktop. For now here is picture and UafErr_Edit.txt