Not really sure, but try going into PS and opening the RAW image from inside PS, first--which should open Camera RAW, also, and see if you still get the error.
See in the file menu where I can open in Bridge, but cannot see where I can open in Camera Raw from PS.
For me in Windows just using Photoshop's Open works when the file is a RAW-type file, with an NEF or CR2 extension.
If you don't have just an Open on a Mac, then do you have an Open As... and then can you change the File Type to Camera RAW then click Done or Open or Ok or whatever it says?
Just trivia: File - Open As - Camera Raw can also get you there for some non-raw file types (JPEGs, TIFFs, PSDs saved with compatibility set).