I'm working on a custom modpack and I'm tweaking the wasteland from BiomesOPlenty to have custom tress and ores generation. The game crashes every time I try to generate a new world. What I am getting from the crash log is that there is an error with the decoration generation, but that's as far as I can tell. The custom generation is using custom blocks that were made by ContentTweaker. I am able to generate a custom world if I don't add decorations, but as this is a specialized pack, I would need those custom decorations as well. I've included the config file as well in case that helps point out where the issue could be.

The radius you've set for your cluster decoration is way too large. It keeps spilling over into new chunks causing never-ending cascading world gen. The radius of a chunk is 8, so you want to keep it under 8 to avoid too much cascading. Anywhere between 8-16 should eventually stop, but 16 and over will always cause never-ending cascading.

If you're looking to add decorations that large, either open a new issue as a feature request (it would have to be noised based to cross multiple chunks) or find another mod that can do that.

Thank you. It was the misunderstanding of what radius meant. Modified the script and now the world generates without any issue.