Hello.
Are you certain you are not running any mods as you have selected in this report? As this is possibly related to mod compatibility issue

Well, no, not now. When I loaded the game and selected a play option, it returned errors. I was sure that I didn't have mods, but it's been quite a while since I played. This time, instead of selecting an option to play, I went to the workshop and found 4 mods downloaded. I deselected them, and the program works. So I guess mods aren't worth downloading right now. I'll try plain vanilla. Thank you very much for the quick response. I can invest some time in the game now.