Database restore does not work

Hi all,

I opened rekordbox yesterday, and he doesn't seem to find the master database. My music and database is stored at an external usb drive. I've selected the right station: G. Nothing changed. (with Preferences>Advanced>Replace database).

I tried to restore the library, but doesn't work also. I don't know what file I have to select if I want to restore the library. It looks like the database dissapeared. 

The folder Master looks like this, is there something missing? I see one file of 14/07/24. That was my last gig, so at that point something went wrong I think. Is there a possibility to restore my library?

Thanks in advance.

Kind regards,

Lode