C# - Type Of Argument Object [type] Not Primitive

Jun 8, 2010

I'm trying to create a simple Guestbook web service using ASP.NET WebServices. When trying to serialize a list of objects, I get the following exception:

System.InvalidOperationException: The type of the argument object 'GuestBookService.GuestBookEntry' is not primitive.

How can I fix this error?

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*Update: *
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