Hm, permissions for it are ok, it should be able to execute it. So next probability is .mac sync database or other corruption error.
Do you have .Mac sync enabled? If so, in System Preferences, .Mac, try if any of these or
these tips work, if not ...
"Reset Sync Data..." (make a backup of everything that you sync there first, just in case). That should reset the database.
Apple recommends staying
away form the sync folder, but if it doesn't go away with any of those other options, may need to try as the next resort.
If any of those steps will fix it, I'm curious to see which one did it as I've never seen this exact error on Client as said
