Comment 2 for bug 1299097

That error is generated when the editor tries to change the owner of a
temporary file to be the same as the owner of the file being edited. It
looks like you have permissions problem somewhere. Most likely the user
that owns the file you are editing is different from the user you are
running the editor as. I will change the editor to ignore this error,
but in the meantime you can fix it by fising the file ownership on the
file you are editing.