This error, which appears every time you start Photoshop, is apparently caused by the ‘Adobe Unit Types.osax’ file missing from the /Library/ScriptingAdditions folder. The error message suggests reinstalling Photoshop, but that seems like using a sledgehammer to bang in a nail.
I’ve got no idea how or when mine went missing, but to fix it I simply downloaded a copy of the file from here…
http://kb2.adobe.com/cps/516/cpsid_51615.html
…and dropped it into /Library/ScriptingAdditions, hey presto, no more errors!
Genius. Worked for me. Thanks a bunch!
Thanks. Saved a LOT of work. Crazy Adobe!
Mine went missing when I deactivated CS 4 and had 5 installed already.
Hey, very cool, thanks a lot, I had the same error message in both Photoshop CS5 and CS6, it fixed the error on the two versions of Photoshop installed.