The attached zip file contains a block file. I selected all objects on a floor in a project. I said copy to file and made a block. Then when I said paste from the file, the program broke. I tried to call it into a new project and the same situation happened again. I tried the same thing for another floor, same thing happens again. I don't know which object is caused by incorrect blocking. Maybe try one by one. All columns or all beams or, I don't know, other elements can be blocked one by one, but I did not examine them. I present it to your information. If you find that it is caused by an object or object type, indicate it and I will block it without selecting that object. Good luck with.