Critical Error Saving Project. Any ideas?

Hi guys! We´ve been working on a huge project since a few months on 3 computers using the collaboration mode with server, everything worked perfect till today. Now every time we try to delete some video clip from any timeline we get this error "Critical Error Saving Project". we also get 2 options: "Reload Current" or "Export Changes and Reload". We tried both of them but nothing changed. We've restarted all the computers, Davinci many times, too. We really don't know what to do in this situation. Hope for your help. Thank you in advance!

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