while TT kept telling me it couldnt save my return (to a thumb drive) it saved the files. when it came time to efile - got the above error.
[ANSWER] copied my TT file onto the hard drive; opened that file (had to enter all the efiling info again) and processed the return.
both files show the same permissions, were never locked.
attention: TT told me i need to upgrade MAC software to use it next year. this old macbook cant go there so i'm scrambling to find a better solution.
