I had this problem, as many others.
I have tried :
Remove the Aggregate Devices plist file.
Loged in as the root user. Once you are logged in as root, relaunch your Adobe software and repeat the process that generated the error. After you have verified that the software functions correctly, you can return to your regular user account.
Reinstalled my OS
Reinstalled PP 6
No luck
Then I made a new user account which I use when working with PP and everything works fine !
Bjorn Erik