Serialization in SSIS

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SQL

WCF

SSIS

Hello everyone,
I am stuck into a problem i need some help or some directions.Actually i am Working on SSIS(Sql Server intergration Service) where i am calling WCF to get data(calling a function which is returning me generic list) i am serializing that list but i am getting this, error

[Script Component [6]] Error: System.InvalidOperationException: There was an error generating the XML document. ---> System.TypeInitializationException: The type initializer for 'Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterVirtualCatalog' threw an exception. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterVirtualCatalog..cctor()
--- End of inner exception stack trace ---

i am using XMLSerializer. So tell me where is the exact problem and how to fix it.