Fix a build that will not load
Most build failures are one of four things: the mod version, the file location, the paste position or the world version.
Work through the questions below before reinstalling anything.
If something does not work
The hologram or paste is invisible
Check that the mods match your running Minecraft version and loader. Then confirm the file is loaded from the correct folder and the placement is inside render distance.
The build appears but blocks are missing or rotated
Check the source version, your game/mod versions and the original model. The -a flag only skips air; it does not fix missing block states or orientation. Undo a misplaced paste before adjusting rotation and trying again.
The datapack does not appear after /reload
The zip must sit directly in datapacks/ (not nested), and the world must be Java 1.20.1. Check the server console for the pack name.
Can I undo a bad paste?
WorldEdit: //undo immediately. Litematica placement: break the blocks or restore the area from a backup. The site cannot undo changes in your world.