"Cannot create file" error

When I open biblioscape I get a "Cannot create file X" (X is the bsl file for the database), I tried rebuilding and it's still the same.
this started yesterday after opening a database (not the one we usually work with) and getting all kind of errors, including many error messages while trying to rebuild it (at last we could rebuild it without errors but then we are in this situation)

It sounds like Biblioscape

It sounds like Biblioscape does not have the privilege to write files to your disk. Where does your database folder resides? Do you have write privilege to that folder?