Try updating your Graphviz. I tried the file and it worked fine for me. Here's the verbose output:
dot - graphviz version 2.36.0 (20140111.2315)
Using render: cairo:cairo
Using device: png:cairo:cairo
libdir = "/usr/local/lib/graphviz"
Activated plugin library: libgvplugin_dot_layout.6.dylib
Using layout: dot:dot_layout
The plugin configuration file:
/usr/local/lib/graphviz/config6
was successfully loaded.
render : cairo dot fig map pic pov ps quartz svg tk vml xdot
layout : circo dot fdp neato nop nop1 nop2 osage patchwork sfdp twopi
textlayout : textlayout
device : bmp canon cgimage cmap cmapx cmapx_np dot eps exr fig gif gv icns ico imap imap_np ismap jp2 jpe jpeg jpg pct pdf pic pict plain plain-ext png pov ps ps2 psd sgi svg svgz tga tif tiff tk vml vmlz x11 xdot xdot1.2 xdot1.4 xlib
loadimage : (lib) bmp eps gif jpe jpeg jpg pdf png ps svg
fontname: "Helvetica" resolved to: (ps:pango Helvetica, REGULAR) (PangoCairoCoreTextFont) "Helvetica"
network simplex: 28 nodes 27 edges maxiter=2147483647 balance=2
network simplex: 28 nodes 27 edges 0 iter 0.00 sec
network simplex: 4 nodes 4 edges maxiter=2147483647 balance=2
network simplex: 4 nodes 4 edges 0 iter 0.00 sec
network simplex: 1 nodes 0 edges maxiter=2147483647 balance=1
network simplex: 1 nodes 0 edges 0 iter 0.00 sec
Maxrank = 0, minrank = 0
mincross: pass 0 iter 0 trying 0 cur_cross 0 best_cross 0
mincross SchemaCrawler_Diagram: 0 crossings, 0.00 secs.
network simplex: 1 nodes 0 edges maxiter=2147483647 balance=2
network simplex: 1 nodes 0 edges 0 iter 0.00 sec
routesplines: 0 edges, 0 boxes 0.00 sec
Using render: cairo:cairo
Using device: png:cairo:cairo
dot: allocating a 601K cairo image surface (312 x 493 pixels)
gvRenderJobs SchemaCrawler_Diagram: 0.10 secs.
Here's the image that got generated: