Hello! I have a problem with a file, i was making the construction of a building and when i placed a door, an error message appered, i don´t remember what error came out.

After that message, i couldn´t modify the file anymore, i can´t select or add any objects. When viewing the floorplan view in site, building or storey mode it appears completely blank, without plan and buildings, but when viewing in room, it looks normal.

What can i do in this case? is there any way i can fix this file? i appreciate your comments. Thanks.