What does it mean when I encounter the message "No context type can be found in the 'DOC' assembly" while attempting to activate migrations in Code-First?

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This error message means that the Entity Framework (EF) cannot find a context class in the specified assembly, which is typically the assembly with the name "DOC". In other words, EF is unable to locate a class that derives from the DbContext class and acts as the entry point for code-first migrations.

To resolve this issue, you need to make sure that the context class is defined in the correct assembly and namespace, and that it is marked with the DbConfigurationType attribute. Additionally, you may need to double-check your connection string and ensure that it points to the correct database.