Strange error(?) message when invoking lilypond-book

[Speldosa]

I'm running OS X 10.11 and LilyPond version 2.18.2-1. I'm trying to invoke
lilypond-book via terminal by typing the following (I've tried getting the
path option to work, but I've given up after a gazillion tries):

    /Applications/LilyPond.app/Contents/Resources/bin/lilypond-book
Test.lytex

What I'm served with after running this command is the following:

    File "/Applications/LilyPond.app/Contents/Resources/bin/lilypond-book",
line 590
        os.mkdir (global_options.output_dir, 0777)
                                            ^
    SyntaxError: invalid token

Am I even supposed to see this? Is this a valid error message (in that case,
it's not making a lot of sense)? I've been able to locate the origin in the
source code, but that doesn't help me very much.

Anybody got any ideas?



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