hi all

I am trying to move a node to another folder, is checkbox is checked or unchecked. But getting a server error, I can't figure out.

Code:

public UmbracoEventHandlers()
    {

        ContentService.Saving += ContentService_Saving;

        ContentService.Saved += ContentService_Saved;

        ContentService.Publishing += ContentService_Publishing;


    }

    void ContentService_Saving(IContentService sender, SaveEventArgs<IContent> e)       {

        foreach (IContent item in e.SavedEntities)
        {
            if (item.HasProperty("messageArchived"))
            {
                if (item.Properties["messageArchived"].IsDirty())
                {
                    var isArchived = Convert.ToBoolean(item.Properties["messageArchived"].Value);
                    var contentService = ApplicationContext.Current.Services.ContentService;

                    if (isArchived)
                    {

                        var archiveContent = item.Parent();
                        IContent archiveMessageFolderContent = null;

                        foreach (IContent child in archiveContent.Children())
                        {
                            if (child.ContentType.Alias == "messageArchive")
                            {
                                archiveMessageFolderContent = child;
                                break;
                            }
                        }

                        contentService.Move(item, archiveMessageFolderContent.Id);
                        library.RefreshContent();
                    }
                    else
                    {
                        var archiveContent = item.Parent().Parent();
                        contentService.Move(item, archiveContent.Id);
                    }

                }
            }
        }
    }
    void ContentService_Saved(IContentService sender, SaveEventArgs<IContent> e)
    {

    }
    void ContentService_Publishing(IPublishingStrategy sender, PublishEventArgs<IContent> e)
    {

    }

Error:

Received an error from the server

An error occurred

Object reference not set to an instance of an object.

Exception Details:

System.NullReferenceException: Object reference not set to an instance of an object. Stacktrace:

at websiteumbracoext.UmbracoEventHandlers.ContentServiceSaving(IContentService sender, SaveEventArgs1 e) in classes\UmbracoEventHandlers.cs:line 59 at Umbraco.Core.Events.ScopeEventDispatcherBase.DispatchCancelable[TSender,TArgs](TypedEventHandler2 eventHandler, TSender sender, TArgs args, String eventName) at Umbraco.Core.Services.ContentService.SaveAndPublishDo(IContent content, Int32 userId, Boolean raiseEvents) at Umbraco.Core.Services.ContentService.PerformMove(IContent content, Int32 parentId, Int32 userId, ICollection1 moveInfo) at Umbraco.Core.Services.ContentService.Move(IContent content, Int32 parentId, Int32 userId) at website_umbracoext.UmbracoEventHandlers.ContentService_Saving(IContentService sender, SaveEventArgs1 e) in classes\UmbracoEventHandlers.cs:line 59 at Umbraco.Core.Events.ScopeEventDispatcherBase.DispatchCancelable[TSender,TArgs](TypedEventHandler2 eventHandler, TSender sender, TArgs args, String eventName) at Umbraco.Core.Services.ContentService.SaveAndPublishDo(IContent content, Int32 userId, Boolean raiseEvents) at Umbraco.Core.Services.ContentService.Umbraco.Core.Services.IContentServiceOperations.SaveAndPublish(IContent content, Int32 userId, Boolean raiseEvents) at Umbraco.Core.Services.ContentService.SaveAndPublishWithStatus(IContent content, Int32 userId, Boolean raiseEvents) at Umbraco.Web.Editors.ContentController.PostSave(ContentItemSave contentItem) at lambda_method(Closure , Object , Object[] ) at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters) at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments) at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary2 arguments, CancellationToken cancellationToken) --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Web.Http.Controllers.ApiControllerActionInvoker.