Hi robert,

I upgraded a website from 4.7.2 to 6.1.6. But now it gives the following error when reloading the scheduled tasks. I changed the ClientDependency and emptied the folder, but it doesnt work.

The scheduled tasks that were set, seem to be running though. So no problems on that part. Would you have any idea what to do with this?

thanks!

Martin

[NullReferenceException: Object reference not set to an instance of an object.]

   umbraco.cms.presentation.Trees.JsTreeNodeConverter.Serialize(Object obj, JavaScriptSerializer serializer) +130

   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +85

   System.Web.Script.Serialization.JavaScriptSerializer.SerializeEnumerable(IEnumerable enumerable, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +126

   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +1380

   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +194

   System.Web.Script.Serialization.JavaScriptSerializer.Serialize(Object obj, StringBuilder output, SerializationFormat serializationFormat) +26

   System.Web.Script.Serialization.JavaScriptSerializer.Serialize(Object obj, SerializationFormat serializationFormat) +74

   umbraco.businesslogic.Utils.JSONSerializer.Serialize(Object obj) +11

   umbraco.cms.presentation.Trees.XmlTree.ToString(SerializedTreeType type) +97

   umbraco.cms.presentation.Trees.XmlTree.ToString() +12

   umbraco.presentation.webservices.TreeDataService.ProcessRequest(HttpContext context) +132

   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +100

   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75