Edited Unassigned: Rebuild for Q16-HDRI-AnyCPU Errors [1390]

Dear experts,
I've download Magick.net source code from https://magick.codeplex.com/SourceControl/latest.
I want to modified files Magick.NET/Core/MagickImageCollection.cs, Magick.NET/Core/MagickImage.cs, Magick.NET/Core/MagickImageInfo.cs with add attribute Serializable() to make classs serializable, when i rebuild solution it raise many error that I don't understand (Also I've refer at https://magick.codeplex.com/SourceControl/latest#Building.md).

Someone please help me.