Upgrading from Windows Server 2008 R2 to Windows Server 2012

344900 pts.
Tags:
Windows Server 2008 R2
Windows Server 2012
We've been trying to upgrade from Windows Server 2008 to 2012. On our compatibility check, we keep getting this error:
Active Directory on this domain controller does not contain Windows Server 2012
ADPREP /FORESTPREP updates. See http://go.microsoft.com/fwlink/?LinkId=113955.
We did what was suggested but we're still getting the error. What should be our next step? Thanks for the help.

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