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The `System.ComponentModel.DataAnnotations.UrlAttribute` class is not found in Mono 3.0.12. To verify this, I have created a repro at https://github.com/ErikSchierboom/monodataannotations. That projects shows that decorating properties with the `System.ComponentModel.DataAnnotations.UrlAttribute` will cause Mono 3.0.12 to throw the following exception:
Missing method .ctor in assembly /tmp/root-temp-aspnet-0/1d156a4d/assembly/shadow/d3af320d/907b835b_43d4b156_00000002/MonoDataAnnotations.dll, type System.ComponentModel.DataAnnotations.UrlAttribute
Can't find custom attr constructor image: /tmp/root-temp-aspnet-0/1d156a4d/assembly/shadow/d3af320d/907b835b_43d4b156_00000002/MonoDataAnnotations.dll mtoken: 0x0a000017
This error message shows that no constructor can be found for this class, which should be in the System.ComponentModel.DataAnnotations namespace.