汇编中的errorType'System.Data.SqlClient.SqlConnection'

Question

在本地工作正常但是当我发布到生产时它会在日志文件中给我这个错误 在日志文件中：

03/07/2014 17:15-->
Type 'System.Data.SqlClient.SqlConnection' 
in Assembly 'System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' 
is not marked as serializable.; 
Stack Trace:    
   at System.Runtime.Serialization.FormatterServices.InternalGetSerializableMembers(       RuntimeType type)     
   at System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type type, StreamingContext context)
   at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo()
   at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder)
   at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder)
   at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck)
   at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck)
   at System.Web.Util.AltSerialization.WriteValueToStream(Object value, BinaryWriter writer); Source: mscorlib
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可能是什么问题？