I get
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warning 6038: The default target Entity Framework version requires the edmx schema version 2.0.0.0 or lower. The specified schema is version 3.0.0.0. To avoid this warning specify the target Entity Framework version explicitly. You can do this by using the EdmGen.exe command-line tool with the targetVersion option, or by including the targetEntityFrameworkVersion parameter when calling the GenerateCode method.
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The type or namespace name 'Mapping' does not exist in the namespace 'System.Data' (are you missing an assembly reference?)
Patrik