hi, have installed uBlogsy I am getting a null exception when creating a new post, the post gets created ok but when creating i see the following error, could anyone assist with this please ?

Thanks in advance

[NullReferenceException: Object reference not set to an instance of an object.]
uBlogsy.BusinessLogic.DocumentService.EnsureCorrectPostNodeName(Document doc) +227
uBlogsy.BusinessLogic.EventHandlers.UmbracoExtensions.Document_AfterSave(Document sender, SaveEventArgs e) +309
umbraco.cms.businesslogic.web.SaveEventHandler.Invoke(Document sender, SaveEventArgs e) +0
umbraco.cms.businesslogic.web.Document.Save() +335
umbraco.cms.businesslogic.web.Document.MakeNew(String Name, DocumentType dct, User u, Int32 ParentId) +1413
umbraco.contentTasks.Save() +75
umbraco.presentation.create.dialogHandler_temp.Create(String NodeType, Int32 TypeId, Int32 NodeId, String Text) +683
umbraco.cms.presentation.create.controls.content.doCreation() +224
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +153
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3706