It seems that you have a problem with the link to your external reference file (red cross on 1st line).
I'm on SW2019.
I loaded your file and when it opens it asks me this: "Open referenced external documents".
So I chose to "Don't open any referenced document" and it works perfectly.
There is just a "?" at the end of the line "parting line G... " because I don't have access to your external reference. But all of them work.
Otherwise, you can try breaking the external references before saving. The problem with this method is that you lose all links with the starting part. So if you change it, the changes won't follow in this file.
I have this window when I open your file (see link).
The window you show me is the one to break the links with external references. Be careful, if you click on "break everything", you lose all the links to the piece that served as your model. So if you later modify your model, you won't see it in this room.
I tried all 3 options, they all work... Your room opens up very well at my house.
Not being able to reproduce the defect, I will not be of much help.
For my part, I have the same message as @a.eriaud at the opening. Indeed it opens but when I want to edit it it informs me that the database is not found:
Would it be possible for you to post the said database?
and if I go through a copy made on the desk, it goes better in the sense that when I open it it asks me to look for a part, if I make it look and find it, it goes badly,