diff against the working directory with git-latexdiff

I use git for my latex document and I want to diff against the working directory.
MWE:

documentclass{article}
begin{document}
  a
end{document}

add git-latexdiff to $PATH in .bashrc

PATH=$PATH:~/path/to/dir/git-latexdiff/

setup git:

git init; git add .; git commit -m "initial commit"

change content of file from a to aa

git add file.tex; git commit -m "2nd commit"

change content of file from aa to aaa

(use git log to see hashes for commits)

git-latexdiff -v --main file.tex hash1 hash2

(-v is verbose, –main specifies the main file, hashes identify commits)
works just fine.

But when I try to commit against the uncommitted working directory:

user2740$ git-latexdiff -v --main file.tex hash1 --
Auto-detecting PDF viewer ... xdg-open.
/usr/bin/latexpand
Creating temporary directories ... done.
Temporary directories: /tmp/git-latexdiff.3840/old and /tmp/git-latexdiff.3840/new
Checking out old and new version ...ln: failed to create symbolic link ‘./file.tex’: File exists

version:

user2740$ git-latexdiff --version
1.0                                  #downloaded 09.05.2014

Works Now:

Make sure to use the latest version!

Execute only in your desired directory even for version information. (at least for version v1.1.2-1-ga985a4f)