Mail cannot access your mailbox information because it’s already in use
Im trying to move my emails from catalina to a fresh install. When i open mail i get this error and clicking rebuild just brings the error back up. The mail files are not on a network and i don't have a system administrator, i have restarted.
Can anyone help me fix this ? Is it a permissions issue ?
Thanks. Alex
MacBook Pro 15", macOS 10.15