on loading into worlds, i ctd with the following crash log
https://pastebin.com/RUTE8f8E
i can launch and open worlds when using structure essentials, but the log is still spammed with that error, and it causes a serious amount of lag. i have no clue what is causing it, if its a compatibility issue or something else, but ;0;

Somewhere in your config you have the "lower" value of something set higher than the "upper" value of that thing. Looks like it's in the Underground Style system so it's likely a busted config for Corundum or Permafrost.