Unknown server tag 'SPSWC:CategoryNavigationWebPart'

Hello SharePointers,

I'm migrating a SharePoint 2003 farm to SharePoint 2013 using the attach - upgrade content database method. The migration process to 2007 was fine, no errors here. But the process to 2010 came with some errors. After completing the upgrade in 2010, when opening the portal, the following message was displayed

Could not load type'Microsoft.SharePoint.WebControls.HomePage from assembly Microsoft.SharePoint.Portal

I removed it, and them, another surprise

Unknown server tag 'SPSWC:CategoryNavigationWebPart'.

Then i figured two problems here.

First: The tag 'SPSWC:CategoryNavigationWebPart'were found inside every default.aspx (welcomepage of every subsite). Removing it implies in remove the navigation menu, and the tag is inserted within default.aspx. Not the page layout, neighter the masterpage. (the portal has about 430 subsites. It is a lot of pages to edit / tags to remove )

Second: The tag in this context is the navigation tag. Removing it implies to remove the portal navigation (Maybe  recreating the masterpage and a new page layout would insert the navigation again)

How do I completely upgrade my 2003 to 2013 ? Do I need to remove it manually (programatically) ?