This error I have seen two ways. 1: You go through the process of generating a world, adjusting the settings for the gen etc, and it generates fine, but now the UI for generating appears over it. It lets you back out of the new ui and can then use the world. 2: Same but when you back out you have no option but to alt+f4 to exit and start again.
I've searched and read some good advice on how to fix or at least get things working again. I made no changes and everything was working fine, except for issue type 1. Which was fine, was able to play for hours and hours. I am assuming this one is a mod in the wrong spot in the load order. I now have been having issue type 2. I tried a variety of things to fix, up to and including the complete removal of everything and manual deletion. Everything fresh. Still an issue. Then I went and began removing one mod at a time. When I removed Geological Landforms by
m00nl1ght, it reverted back to issue type one and game is playable again. But this doesn't really solve it does it? I don't think this mod was the ultimate culprit as there had been no issues before. I still think it might be a load order issue combined with a compatibility issue maybe involving more than 2 mods, as shown with the removal of the one. Any insight by others with similar issues and maybe better results appreciated. I do use several map gen mods like Reroll map etc. So I am not surprised when there is a conflict etc. Most times I can solve it as it is usually the only one added at the time. Sometimes it is related to a recent update, then comes the hair pulling. Love the game, and how you can have all kinds of stories and play throughs, impart by the game devs and in part by the wonderful modding community at large.