Altium designer - saved PCB missing

I have a big problem !

In altium designer i have made PCB for my electric scooter, which was not easy, and i saved it and 2 other PCBs. When i hit close, altium asked me of something (i didnt remember what, i thought it wasnt something big), i hit close (or ok), and now i want to open that PCB,

and it is BLACK. Nothing on it. What can i do?

This is the message i have got.
Access violation at address 74BD2030. Read of address 74BD2030 at 74BD2030.