2 sided option in print option greyed out
I'm trying to print out of my text only book, made in Booksmart, for proof reading. It is 194 pages so I want to print double sided, however this option appears as greyed out when I try and do it. Has anyone any suggestions as to how I can enable this? I've attached a screenshot.
Screen Shot 2015-03-08 at 20.12.26.png
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