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Vertex generation doesn't exist …?

Magento 2.2.4, php7. I' ve been having this error when I try to switch to production and when i try to di:compile; Source class \Vertex for \Vertex\Mapper generation does not exist. No errors in ...
5
votes
3answers
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Uncaught TypeError: Argument 1 passed to […] must be an instance of

I have been having this issue for several weeks now and after looking through similar issues on this site and others, I still can't figure out how to solve this problem. After successfully executing ...