Lync Server 2013 installation error : Prerequisite not satisfied: This product cannot be installed on a domain controller.

Hi,

     I am trying to install Lync server 2013 on my AD server (windows server 2012). Upto windows identification prerequisite its got installed after that I got error that "This product cannot be installed on DC". I think this was because I installed lync server on my AD server.... can u please tell me is this because of that ???