The connection string 'MyConnection' in the application's configuration file does not contain the required providerName attribute."

Question

I use Entity Framework Code First,

My connection string is in a configuration file:

    
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Answer 1

In my case the problem was with an incorrect StartUp project target. In the PM console the target migration assembly project was correct.

I have a multiproject solution and the target was on some web-service project.

So I changed the StartUp to the main WebSite project and the migration have complited without errors.