When I want to save and load a building with a structure block nothing happens. I don't understand why it isn't working.

1. I put the structure blocks in the right corners
2. Than save them on a seperate structure block
3. And than when I want to load the saved structure nothing happens.

It only says that it is loaded but there's nothing loaded infront of me.

Usually there are some coloured lines around the structure, too before loading the structure, but now there's nothing it just says it is loaded.

Pls help me i don't know what to do!