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hi Thanks for giving me response, I have analyzed your URL and it is possible in most eCommerce site that Google find duplicate page title error in subcategory pages. Google consider these both URL same (http://www.gizmocrazed.com/category/android/)(http://www.gizmocrazed.com/category/gadgets/android/) That’s why it places the error but no need to worry about this error because i found canonical code in your source code. So no need to worry it is minor error and it does not affect in ranking.