Error unexpected file format! Help

hi yesterday I worked all day on a project and this morning I appeared the words “unexpected file format”
I tried the solutions written below but nothing. Could someone help me ? thanks

link

There was no problem to open for me…. I purged it:

With what sketchup verisone you work ?
I don’t understand why your version doesn’t open up to me, it’s frustrating.

Saved to previous version (2020)

thank you from the bottom of my heart!
It works !!!

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Your forum profile shows you are using the current version, SketchUp 2023. Is that not correct?

That could be correct …It is very likely that she/he has an earlier version than I (or You) do. :closed_lock_with_key: