You need to check the ownership and permissions on that directory and its subdirectories. Unfortunately not being a mac user I cant recall how to do that using the OS X gui, but in a terminal you can reset permissions using the chown and chmod commands.
Alternatively, just rename that directory and calibre will create a new one for you with hopefully the correct permissions. But note that doing so means you lose all calibre settings/plugins.
Last edited by kovidgoyal; 06-09-2016 at 09:24 PM.
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