Erreur du serveur dans l'application '/aspnet_client'.

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[SerializationException: Le type 'System.Web.Administration.WebAdminRemotingManager' dans l'assembly 'App_Code.z9kixqnn, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' n'est pas marqué comme sérialisable.]
   System.Runtime.Serialization.FormatterServices.InternalGetSerializableMembers(RuntimeType type) +2318005
   System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type type, StreamingContext context) +245
   System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo() +88
   System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter) +305
   System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter) +50
   System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck) +438
   System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck) +131
   System.Web.Util.AltSerialization.WriteValueToStream(Object value, BinaryWriter writer) +1551

[HttpException (0x80004005): Impossible de sérialiser l'état de session. En mode 'StateServer' et 'SQLServer', ASP.NET sérialise les objets d'état de session, et par conséquent, les objets non sérialisables ou les objets MarshalByRef ne sont pas autorisés. La même restriction s'applique si une sérialisation similaire est effectuée par le magasin d'état de session personnalisé en mode 'Personnalisé'.]
   System.Web.Util.AltSerialization.WriteValueToStream(Object value, BinaryWriter writer) +1641
   System.Web.SessionState.SessionStateItemCollection.WriteValueToStreamWithAssert(Object value, BinaryWriter writer) +35
   System.Web.SessionState.SessionStateItemCollection.Serialize(BinaryWriter writer) +632
   System.Web.SessionState.SessionStateUtility.Serialize(SessionStateStoreData item, Stream stream) +259
   System.Web.SessionState.SessionStateUtility.SerializeStoreData(SessionStateStoreData item, Int32 initialStreamSize, Byte[]& buf, Int32& length) +61
   System.Web.SessionState.SqlSessionStateStore.SetAndReleaseItemExclusive(HttpContext context, String id, SessionStateStoreData item, Object lockId, Boolean newItem) +115
   System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs) +612
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +138
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +65