Bad .plist syntax

Last use of the computer an error occurred in the Finder, "closed unexpectedly...." I figured I might have a flummoxed permissions or preference.

so I ran Onyx to verify the SMART & Volume structure, both seem intact. Verified the Preference files and a "Syntax error was found in a couple preference files
the error/warning is " Cannot parse a Null or zero length data."

The two files of real concern are the //com.apple.Preference.sharing.plist, and //com.apple.AECT.plist, The remainder involve ///iPod.plist and ///RegAperture.plist

Okay? so what does this error indicate and what is fix?

I do have access via "sharing" screen and files (directories) with an older Mac Pro (runs as a remote directory/drive/backup device, not really a full-on file server but sort of..). Other then that I don't share many resources. I don't use iCloud for anything other than Reminders, and the iTunes Library is sharable but not used.

Thanks