Duplicate content type

I have a sharepoint 2013 site that we just migrated from 2010. When I go to enable site collection publishing features I get the error below. When I go to galleries content type I do not see that content type. Any ideas? 

A duplicate content type name "System Master Page" was found".

July 30th, 2015 8:59pm

Try this 

http://www.interdynbmi.com/blog/how-resolve-upgrade-issues-duplicate-content-types

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July 31st, 2015 3:01am

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