Preparing Database

I am currently in the process of upgrading from 12.1.1 to 12.1.6, I will be installing 12.1.6 on Windows Server 2012 R2. When I get to adding the database(using existing database) I get "The server schema is higher than the database schema. The configuration cannot continue for adding new server"

12.1.1 is on a Windows Server 2003 box and the database is SQL Server version 10.0.

How do I go about fixing this issue?

Thanks,

Adrian