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Howdy You might find this useful https://github.com/TheGreyGhost/MinecraftByExample See MBE30, MBE31, MB32 These are GUI which are based around containers but the basic principles are still the same even if you don't have a container. It should help you get a start on understanding how the vanilla GUI work. Cheers TGG

Please provide debug.log (more info on where it is and how to provide it in my signature below, just expand the spoiler)

Hello How I find the new name when it has changed version (eg from 1.12 to 1.16): 1) Find the code in 1.12 which calls .isMaterialInBB(); for example EntityLlamaSpit:onUpdate....-> if (!this.world.isMaterialInBB(this.getEntityBoundingBox(), Material.AIR)) { this.setDead(); } else if (this.isInWater()) { this.setDead(); } 2) Look at EntityLlamaSpit in 1.16.4: (LlamaSpitEntity::tick ) if (this.world.func_234853_a_(this.getBoundingBox()).noneMatch(AbstractBlock.AbstractBlockState::isAir)) { this.remove(); } else if (this.isInWaterOrBubbleColumn()) { this.remove(); } else { -TGG

1.7 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.