@mlplouff - its a file access error "[Errno 13] Permission denied: '/Volumes/Plouff Shared/Calibre Master Library PlouffMain"
For some reason the calibre user is being denied access to that file, it needs to fixed at the level of OS/X, if you know how to manipulate access control lists on OS/X then start there, otherwise wait for an OS/X guru here, or ask on an OS/X guru forum.
BR
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