In the backtrace I supplied, "emacs" is the root of the subversion sandbox and "src" already exists, whereas "newdir" doesn't.

-- Anders

On Sun, Nov 22, 2015 at 7:59 PM, Eli Zaretskii <eliz@gnu.org> wrote:

> Date: Sun, 22 Nov 2015 19:40:32 +0100
> From: Anders Lindgren <andlind@gmail.com>
>
> emacs -Q
> (setq debug-on-error t) ;; To get a backtrace
> C-x C-f a/path/to/a/new/directory/in/a/subversion/sandbox/newfile.txt

Which part(s) in this file name don't exist? And where's the part
that is the SVN sandbox?