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Problem with several back end pages

Problem with several back end pages

I have a magento 2.1.2 install.  I have used the data migration tool to migrate a magento setting and data as per this guide. 


I am getting the following error message on a couple of pages when I try to navigate to them in the backend.


Class Magento\Framework\DB\TransactionFactory does not exist

I get this when trying to go to  Content --> Design --> [my store] --> edit

I also get it at Stores --> Configuration


These are the only two I have found so far.


Can anyone shed any light on what this might be?  I am guessing it might be an extension that is missing?


Thank you.