Missing elements at Rv file openning

[yes_and_no]

Upon opening a project, I get this message.

Wonder how to fix it.

It ran for the next 3 save files in the row.

The next workable file is a week earlier.

Help pls.

[preechapon]

First aid is to try audit file but If file cannot audit, Try this topic from Autodesk Knowledge

https://knowledge.autodesk.com/support/revit/troubleshooting/caas/sfdcarticles/sfdcarticles/Revit-fi...