Please include the log file in your bug reports.
You are invited to contribute ruins to the mod. You can use the dedicated ruin maker mod to easily create ruins in-game. You can also manually create or edit ruins, their format is documented here: Ruin data format.
If you know your way around Lua, please make a pull request that includes the ruin files and requires them in the Lua files in /ruins. Otherwise, you can zip the generated files and attach them to a new GitHub issue to submit them as an addition to this mod.