dialogHandler_temp.Create() causing a nullReferenceException

I am trying to replicate the create content function for a custom context item. When I click create I get the following NullReferenceException, can anyone suggest anything. (I have asked a couple of times--perhaps not as clearly-- but I am desperate, I only have 3 days of my internship left and this would be a great way to go out)

[NullReferenceException: Object reference not set to an instance of an object.]
   umbraco.presentation.create.dialogHandler_temp.Create(String NodeType, Int32 TypeId, Int32 NodeId, String Text) +278
   OptionalMultiLangPage.DoCreation() in c:\inetpub\wwwAmaris\optional_multiLang.aspx.cs:116
   OptionalMultiLangPage.SbmtClick(Object sender, EventArgs e) in c:\inetpub\wwwAmaris\optional_multiLang.aspx.cs:97
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +154
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3803