What's the issue you encountered?

On single player, I cannot log into existing worlds or create new worlds. Existing worlds indicate a datapack error, new worlds crash with the following crash report: https://pastebin.com/vnjHa6yF. This happens with version 1.1.0.77 back to 1.1.0.73. This error I rolled back to 1.1.0.73 hoping it would work since I had been previously playing an existing world with it.

With .77 installed the Game Crashed screen (upon attempting to create a new world) says: The game crashed whilst mouseclicked event handler Error: java.lang.RuntimeException: Biomed indices have been registered but haven't been utilized: [12]. Either utilise the uniqueness assigned to your biome provider or set your provider's weight to 0. Exit code: -1

How can the issue be reproduced?

The error log & crash report record my attempt to start an entirely new world. I even rolled back to version 1.1.0.73 & the crash still happened.

Logs

https://pastebin.com/PLfzZBf7

Mod Version

1.18.1-1.1.0.77 down to 1.18.1-1.1.0.73

Additional information

I run Biomes O Plenty, BYG, & Terralith. All have been working just fine together until the .77 update. I deleted all related config files for all the mods & the error still happens for both existing & new worlds.

You have a feature order cycle which is an issue between biome mods, not TerraBlender itself. This has repercussions that cause TerraBlender to crash, however I wouldn’t consider that to be a TerraBlender bug. You’ve probably recently updated a biome mod of some sort which has introduced a feature order cycle and thus caused this to happen

Thank you for the prompt response! It turned out to be Terralith. I saw a mention of Terralith (different problem) & decided to see what would happen if it took it out. Lo & behold I could create new worlds again. I'm not sure it was working correctly so no loss there. Thanks again!