Hi,
I have been using this plugin for quite a long time. But as soon as update it to 1.12.2 or 1.12.1, it just cannot run as before.

Environment: Single Player and Server
Trigger: Loading any schematics (load correctly in versions before 1.12)

Schematica - 1.12.2
https://pastebin.com/Vy7zJ3mt

Schematica - 1.12.1
https://pastebin.com/nwVcDkNG

I have already updated all required mods to the latest version of that MC version, but still not working.
Please kindly help and see if I need to do anything else.

Thanks a lot

That is an issue with Magic Launcher. Put the mod files into the mods folder, it should fix the issue.