Mediabay- Can't create a Volume database

When I try to create a volume database of any disk I have error (see attachment)
Can I fix it? (mac os El capitan)

ok! I solve the problem with external disks… In disk permission You need to set “stuff” group read/write
Mediabay working very fast now!
on system Disk I Can’t do this…

pS: try to remove scan preset folder on startup on macintosh hd… can’t do this yet