When you reference a wcf in silverlight 4 and build the project,sometime you may got the
System.Action<T> invalid arguments exception!
In my case,it's because there is a method which return a DataTable Type value in the wcf services!
I just change the return type from DataTable to object,then everything is ok!
Because Silverlight dose not suport ADO.net's DataTable and DataSet serialize!
Hope this is help!
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