Hi, i cant paste schematic to the world, i use litematica for year, and this is first time this happened to me. I tryed reconnect, replace schematic, and still not working. Any idea how to fix it? I dont want to place 80k block by hand..

You don't have the placement selected. Middle click with the tool item while looking at it. Or alternatively click on it in the Schematic Placements menu so that it has the white outline indicating it's selected.

Okay, thats kinda weird, this is first time happening to me :D thx <3

I'm guessing you either middle clicked with the tool item while not looking at the placement, which unselects it, or you had another placement loaded and selected which you then unloaded - any other placements left loaded would not be selected automatically.