C# Could not load file or assembly 'DAL' or one of its dependencies.

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. 1.Could not load file or assembly ' DAL' or one of its dependencies The system can not find the file specified.

Cause: The cause of this error is because you want to reference files found.
Solution: need to reference files are copied to the appropriate folder, as I file this in the U layer need to reference the D layer, supposedly quoted, but the Debug U layer is not actually a file D layer, so a copy of it myself.