I think all the model still present in the file Dave gave me only the materials gone. Noted , I’ve had a backup of the fixed file. Thank you for your time 
No! The materials are not gone. Only the unused materials which were purged with the unused components were removed. The rest are still present in the model. As I wrote. It’s just the style has been changed to show the model without materials.
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Hello guys, I’m having the same problem. Failed to open document. Can anyone help me please. Here’s the file (adi-23-13-int-back up) . adi 23-13 lumion - Google Drive
You haven’t shared the .skp file.
Are you using the cracked version of SketchUp 2021?
Can you also recover my file. Problems the same, cant open it, it says “Failed to open document”
Dear people asking for help.
you need to actively allow access to anyone with the link. otherwise nobody can download. 
Im sorry, its public now. RIVERA.skp - Google Drive
I hope you can help me with one, I have a submission tonight. I dont know what happen.
Can’t open it.
After checking inside, it starts fine, then about 1/6th of the data, it’s just 0
So maybe Colin ca save something from this 1/6 file. but I can’t.
Two questions, do you have the backup file ? your profile doesn’t make sense, your operating system is not 2023, it’s either windows or mac os, with a version number. but your file tells me it’s from 23.1.340 so PC.
Do you have the skb file ? if you rename it as skp, does it open ?
where was your project located ? external drive ? usb stick ? directly on your drive ? it looks like the synchronisation / the copy failed during the process.
I dont have a back up file, it didnt create one when Im doing the model. It just crash on the middle of the process. Im using skp 2023. I always save it on my local drive on my laptop
Well, it’s 2.30 am in Colorado, so you won’t get a definitive answer for a few hours. at this point, the best thing is to start again right away and hope they can salvage stuff.
Also, make versions.
Don’t just work in ONE sketchup file, every now and then, you make a copy and you archive it just in case.
when I was a student, for a 16 week project, I would have 16 distinct files. Every week, a new version, just in case.
Okay, thank you for your time. I hope Colin will notice this soon. badly needed some help.
I know I fail to get anything even if only a small part of the file is filled with zeros.
It’s worth checking to make sure there isn’t a backup file. The file would have the same name, but the extension will be .skb. It would be in the same folder as the .skp. If you looked for it with File/Open, the file won’t normally appear in the list.
Same problem, how do yo fix it? (Dropbox - El Tigre.skp - Simplify your life)
Your profile says you are using Free Plan 2021. Does that mean you are using a cracked version?
Where are you saving the file while you are working on it?
I just install this 2021 version as free trail.
I’m trying to open it from my desktop
Why would you do that? Where did you get it? It isn’t available from official sources and hasn’t been supported for a while.You should use the current version if you’re going to use the trial. Your file will open in SketchUp 2024. It’s sluggish due to the file bloat. Fix the incorrect tag usage …
… and reduce the size of the excessively large textures. It would also be a good idea to replace the overly detailed components from the 3D Warehouse with simpler, lower-poly ones.
I would suggest correcting the reversed faces, too. There should be no visible blue back faces.
I have a file that failed to open. We keep getting “Failed to open document” warning, even after changing file location, copying new file, changing file name.
Any possible help from @colin ?
You’ll need to make the file available. As it is, access is forbidden.
What version of SketchUp are you using? There is no Free Plan of SketchUp 2024. Are you using a cracked version? Where are you saving the file as you work on it?
i am trying to open it from my drive