Checked for existing issues

• I have checked for existing issues, and have found none.

Tested latest version

• I have checked that this occurs on the latest version.

GregTech CEu Version

1.3.0

Recipe Viewer Installed

JEI

Environment

Singleplayer

Cross-Mod Interaction

Unsure

Other Installed Mods

ModernUI-Forge-1.20.1-3.10.1.4-universal
journeymap-1.20.1-5.9.21-forge
Jade-1.20.1-forge-11.9.2
monazite-1.20.1-1.1.6
craftingtweaks-forge-1.20.1-18.2.3
probejs-6.0.1-forge
rhino-forge-2001.2.2-build.18
kubejs-forge-2001.6.5-build.7
cloth-config-11.1.118-forge
configured-forge-1.20.1-2.2.3
MouseTweaks-forge-mc1.20.1-2.25.1
BlueMap-3.21-forge-1.20
jei-1.20.1-forge-15.3.0.4
gtnn-1.0.7
gtceu-1.20.1-1.3.0
FluxNetworks-1.20.1-7.2.1.15
megacells-forge-2.4.4-1.20.1
ae2wtlib-15.2.3-forge
appliedenergistics2-forge-15.2.1
architectury-9.2.14-forge
curios-forge-5.9.1+1.20.1
balm-forge-1.20.1-7.2.2
appleskin-forge-mc1.20.1-2.5.1
LimitedLives-1.20.1-Forge-1.2.2
storagedrawers-1.20.1-12.0.3
fruitsdelight-1.0.9
barbequesdelight-1.0.2
miners_delight-1.20.1-1.2.3
FarmersDelight-1.20.1-1.2.4
mysterious_mountain_lib-1.4.5-1.20.1
corn_delight-1.0.4-1.20.1
spark-1.10.53-forge

Expected Behavior

join world

Actual Behavior

Unable to enter the world

Steps to Reproduce

Use KubeJS script add Bedrock ore vein

Additional Information

This bug appears after updating to 1.3.0
log: https://mclo.gs/lpDGbMi
my script：https://mclo.gs/mGGUJIh

wait sorry I misread, you'll have to load the com.mojang.datafixers.util.Pair class and do Pair.of(material, chance) instead of [material, chance]

you don't set the materials like that, as I said.
use the provided builders.

you can't initialize the vein materials with an array.
use the correct builder methods.

Still failing

new script : https://mclo.gs/uAxyozu

Thank you, I used the builder model , I can run it now.